diff --git a/system/src/Grav/Common/Assets/BaseAsset.php b/system/src/Grav/Common/Assets/BaseAsset.php
index 3445f40c4..63435ac60 100644
--- a/system/src/Grav/Common/Assets/BaseAsset.php
+++ b/system/src/Grav/Common/Assets/BaseAsset.php
@@ -14,7 +14,6 @@ use Grav\Common\Grav;
 use Grav\Common\Uri;
 use Grav\Common\Utils;
 use Grav\Framework\Object\PropertyObject;
-use RocketTheme\Toolbox\ResourceLocator\UniformResourceLocator;
 
 abstract class BaseAsset extends PropertyObject
 {
diff --git a/system/src/Grav/Common/Assets/Pipeline.php b/system/src/Grav/Common/Assets/Pipeline.php
index 5e2a8b710..eed4ece6c 100644
--- a/system/src/Grav/Common/Assets/Pipeline.php
+++ b/system/src/Grav/Common/Assets/Pipeline.php
@@ -141,7 +141,7 @@ class Pipeline extends PropertyObject
             }
 
             // Write file
-            if (\strlen(trim($buffer)) > 0) {
+            if (trim($buffer) !== '') {
                 file_put_contents($this->assets_dir . $file, $buffer);
             }
         }
@@ -214,16 +214,16 @@ class Pipeline extends PropertyObject
             }
 
             // Write file
-            if (\strlen(trim($buffer)) > 0) {
+            if (trim($buffer) !== '') {
                 file_put_contents($this->assets_dir . $file, $buffer);
             }
         }
 
         if ($inline_group) {
-            $output = "<script" . $this->renderAttributes(). ">\n" . $buffer . "\n</script>\n";
+            $output = '<script' . $this->renderAttributes(). ">\n" . $buffer . "\n</script>\n";
         } else {
             $this->asset = $relative_path;
-            $output = "<script src=\"" . $relative_path . $this->renderQueryString() . "\"" . $this->renderAttributes() . "></script>\n";
+            $output = '<script src="' . $relative_path . $this->renderQueryString() . '"' . $this->renderAttributes() . "></script>\n";
         }
 
         return $output;
diff --git a/system/src/Grav/Common/Assets/Traits/AssetUtilsTrait.php b/system/src/Grav/Common/Assets/Traits/AssetUtilsTrait.php
index 740033009..0ae92f341 100644
--- a/system/src/Grav/Common/Assets/Traits/AssetUtilsTrait.php
+++ b/system/src/Grav/Common/Assets/Traits/AssetUtilsTrait.php
@@ -58,7 +58,7 @@ trait AssetUtilsTrait
                 if (0 === strpos($link, '//')) {
                     $link = 'http:' . $link;
                 }
-                $relative_dir = dirname($relative_path);
+                $relative_dir = \dirname($relative_path);
             } else {
                 // Fix to remove relative dir if grav is in one
                 if (($this->base_url !== '/') && Utils::startsWith($relative_path, $this->base_url)) {
@@ -66,7 +66,7 @@ trait AssetUtilsTrait
                     $relative_path = ltrim(preg_replace($base_url, '/', $link, 1), '/');
                 }
 
-                $relative_dir = dirname($relative_path);
+                $relative_dir = \dirname($relative_path);
                 $link = ROOT_DIR . $relative_path;
             }
 
diff --git a/system/src/Grav/Common/Backup/Backups.php b/system/src/Grav/Common/Backup/Backups.php
index 25515c5ac..174493e05 100644
--- a/system/src/Grav/Common/Backup/Backups.php
+++ b/system/src/Grav/Common/Backup/Backups.php
@@ -40,7 +40,7 @@ class Backups
 
     public function setup()
     {
-        if (is_null(static::$backup_dir)) {
+        if (null === static::$backup_dir) {
             static::$backup_dir = Grav::instance()['locator']->findResource('backup://', true, true);
             Folder::create(static::$backup_dir);
         }
@@ -100,7 +100,7 @@ class Backups
 
     public static function getAvailableBackups($force = false)
     {
-        if ($force || is_null(static::$backups)) {
+        if ($force || null === static::$backups) {
             static::$backups = [];
             $backups_itr = new \GlobIterator(static::$backup_dir . '/*.zip', \FilesystemIterator::KEY_AS_FILENAME);
             $inflector = Grav::instance()['inflector'];
@@ -166,7 +166,7 @@ class Backups
         }
 
         if (!file_exists($backup_root)) {
-            throw new \RuntimeException("Backup location: " . $backup_root . ' does not exist...');
+            throw new \RuntimeException("Backup location: {$backup_root} does not exist...");
         }
 
         $options = [
@@ -246,6 +246,6 @@ class Backups
     protected static function convertExclude($exclude)
     {
         $lines = preg_split("/[\s,]+/", $exclude);
-        return array_map('trim', $lines, array_fill(0,count($lines),'/'));
+        return array_map('trim', $lines, array_fill(0, \count($lines), '/'));
     }
 }
diff --git a/system/src/Grav/Common/Browser.php b/system/src/Grav/Common/Browser.php
index e4fc3ed5d..037d454e2 100644
--- a/system/src/Grav/Common/Browser.php
+++ b/system/src/Grav/Common/Browser.php
@@ -114,7 +114,7 @@ class Browser
     {
         $version = explode('.', $this->getLongVersion());
 
-        return intval($version[0]);
+        return (int)$version[0];
     }
 
     /**
@@ -144,10 +144,6 @@ class Browser
      */
     public function isTrackable(): bool
     {
-        if (isset($_SERVER['HTTP_DNT']) && $_SERVER['HTTP_DNT'] === '1') {
-            return false;
-        }
-
-        return true;
+        return !(isset($_SERVER['HTTP_DNT']) && $_SERVER['HTTP_DNT'] === '1');
     }
 }
diff --git a/system/src/Grav/Common/Cache.php b/system/src/Grav/Common/Cache.php
index 2ff65e4b5..1f4ed705d 100644
--- a/system/src/Grav/Common/Cache.php
+++ b/system/src/Grav/Common/Cache.php
@@ -12,7 +12,9 @@ namespace Grav\Common;
 use \Doctrine\Common\Cache as DoctrineCache;
 use Grav\Common\Config\Config;
 use Grav\Common\Filesystem\Folder;
+use Grav\Common\Scheduler\Scheduler;
 use RocketTheme\Toolbox\Event\Event;
+use RocketTheme\Toolbox\Event\EventDispatcher;
 
 /**
  * The GravCache object is used throughout Grav to store and retrieve cached data.
@@ -118,7 +120,7 @@ class Cache extends Getters
         $this->config = $grav['config'];
         $this->now = time();
 
-        if (is_null($this->enabled)) {
+        if (null === $this->enabled) {
             $this->enabled = (bool)$this->config->get('system.cache.enabled');
         }
 
@@ -148,7 +150,7 @@ class Cache extends Getters
 
         foreach (new \DirectoryIterator($cache_dir) as $file) {
             $dir = $file->getBasename();
-            if ($file->isDot() || $file->isFile() || $dir === $current) {
+            if ($dir === $current || $file->isDot() || $file->isFile()) {
                 continue;
             }
 
@@ -166,7 +168,7 @@ class Cache extends Getters
      */
     public function setEnabled($enabled)
     {
-        $this->enabled = (bool) $enabled;
+        $this->enabled = (bool)$enabled;
     }
 
     /**
@@ -203,11 +205,11 @@ class Cache extends Getters
 
         // CLI compatibility requires a non-volatile cache driver
         if ($this->config->get('system.cache.cli_compatibility') && (
-            $setting == 'auto' || $this->isVolatileDriver($setting))) {
+            $setting === 'auto' || $this->isVolatileDriver($setting))) {
             $setting = $driver_name;
         }
 
-        if (!$setting || $setting == 'auto') {
+        if (!$setting || $setting === 'auto') {
             if (extension_loaded('apcu')) {
                 $driver_name = 'apcu';
             } elseif (extension_loaded('apc')) {
@@ -296,9 +298,9 @@ class Cache extends Getters
     {
         if ($this->enabled) {
             return $this->driver->fetch($id);
-        } else {
-            return false;
         }
+
+        return false;
     }
 
     /**
@@ -463,7 +465,7 @@ class Cache extends Getters
 
         $output[] = '';
 
-        if (($remove == 'all' || $remove == 'standard') && file_exists($user_config)) {
+        if (($remove === 'all' || $remove === 'standard') && file_exists($user_config)) {
             touch($user_config);
 
             $output[] = '<red>Touched: </red>' . $user_config;
@@ -544,17 +546,17 @@ class Cache extends Getters
     {
         if (in_array($setting, ['apc', 'apcu', 'xcache', 'wincache'])) {
             return true;
-        } else {
-            return false;
         }
+
+        return false;
     }
 
     public static function purgeJob()
     {
         $cache = Grav::instance()['cache'];
         $deleted_folders = $cache->purgeOldCache();
-        $msg = 'Purged ' . $deleted_folders . ' old cache folders...';
-        return $msg;
+
+        return 'Purged ' . $deleted_folders . ' old cache folders...';
     }
 
     public function onSchedulerInitialized(Event $event)
diff --git a/system/src/Grav/Common/Config/CompiledBase.php b/system/src/Grav/Common/Config/CompiledBase.php
index 6e4bb6d4f..3e2022f0d 100644
--- a/system/src/Grav/Common/Config/CompiledBase.php
+++ b/system/src/Grav/Common/Config/CompiledBase.php
@@ -199,9 +199,7 @@ abstract class CompiledBase
         $cache = include $filename;
         if (
             !\is_array($cache)
-            || !isset($cache['checksum'])
-            || !isset($cache['data'])
-            || !isset($cache['@class'])
+            || !isset($cache['checksum'], $cache['data'], $cache['@class'])
             || $cache['@class'] !== \get_class($this)
         ) {
             return false;
diff --git a/system/src/Grav/Common/Config/CompiledBlueprints.php b/system/src/Grav/Common/Config/CompiledBlueprints.php
index a87f0f122..9ad7be6f0 100644
--- a/system/src/Grav/Common/Config/CompiledBlueprints.php
+++ b/system/src/Grav/Common/Config/CompiledBlueprints.php
@@ -13,17 +13,18 @@ use Grav\Common\Data\Blueprint;
 use Grav\Common\Data\BlueprintSchema;
 use Grav\Common\Grav;
 
+/**
+ * Class CompiledBlueprints
+ * @package Grav\Common\Config
+ */
 class CompiledBlueprints extends CompiledBase
 {
-    /**
-     * @var int Version number for the compiled file.
-     */
-    public $version = 2;
+    public function __construct($cacheFolder, array $files, $path)
+    {
+        parent::__construct($cacheFolder, $files, $path);
 
-    /**
-     * @var BlueprintSchema  Blueprints object.
-     */
-    protected $object;
+        $this->version = 2;
+    }
 
     /**
      * Returns checksum from the configuration files.
diff --git a/system/src/Grav/Common/Config/CompiledConfig.php b/system/src/Grav/Common/Config/CompiledConfig.php
index 206480b54..1c92edd9a 100644
--- a/system/src/Grav/Common/Config/CompiledConfig.php
+++ b/system/src/Grav/Common/Config/CompiledConfig.php
@@ -13,16 +13,6 @@ use Grav\Common\File\CompiledYamlFile;
 
 class CompiledConfig extends CompiledBase
 {
-    /**
-     * @var int Version number for the compiled file.
-     */
-    public $version = 1;
-
-    /**
-     * @var Config  Configuration object.
-     */
-    protected $object;
-
     /**
      * @var callable  Blueprints loader.
      */
@@ -33,6 +23,13 @@ class CompiledConfig extends CompiledBase
      */
     protected $withDefaults;
 
+    public function __construct($cacheFolder, array $files, $path)
+    {
+        parent::__construct($cacheFolder, $files, $path);
+
+        $this->version = 1;
+    }
+
     /**
      * Set blueprints for the configuration.
      *
diff --git a/system/src/Grav/Common/Config/CompiledLanguages.php b/system/src/Grav/Common/Config/CompiledLanguages.php
index c7e0ab7d8..ef18145c8 100644
--- a/system/src/Grav/Common/Config/CompiledLanguages.php
+++ b/system/src/Grav/Common/Config/CompiledLanguages.php
@@ -13,15 +13,12 @@ use Grav\Common\File\CompiledYamlFile;
 
 class CompiledLanguages extends CompiledBase
 {
-    /**
-     * @var int Version number for the compiled file.
-     */
-    public $version = 1;
+    public function __construct($cacheFolder, array $files, $path)
+    {
+        parent::__construct($cacheFolder, $files, $path);
 
-    /**
-     * @var Languages  Configuration object.
-     */
-    protected $object;
+        $this->version = 1;
+    }
 
     /**
      * Create configuration object.
diff --git a/system/src/Grav/Common/Config/Setup.php b/system/src/Grav/Common/Config/Setup.php
index a6cbe58f0..6a4d336bb 100644
--- a/system/src/Grav/Common/Config/Setup.php
+++ b/system/src/Grav/Common/Config/Setup.php
@@ -12,8 +12,8 @@ namespace Grav\Common\Config;
 use Grav\Common\File\CompiledYamlFile;
 use Grav\Common\Data\Data;
 use Grav\Common\Utils;
-use Grav\Framework\Psr7\ServerRequest;
 use Pimple\Container;
+use Psr\Http\Message\ServerRequestInterface;
 use RocketTheme\Toolbox\ResourceLocator\UniformResourceLocator;
 
 class Setup extends Data
@@ -158,7 +158,7 @@ class Setup extends Data
             if (\defined('GRAV_CLI')) {
                 static::$environment = 'cli';
             } else {
-                /** @var ServerRequest $request */
+                /** @var ServerRequestInterface $request */
                 $request = $container['request'];
                 $host = $request->getUri()->getHost();
 
diff --git a/system/src/Grav/Common/Data/Validation.php b/system/src/Grav/Common/Data/Validation.php
index 24d64a99c..b077d0e7a 100644
--- a/system/src/Grav/Common/Data/Validation.php
+++ b/system/src/Grav/Common/Data/Validation.php
@@ -12,7 +12,6 @@ namespace Grav\Common\Data;
 use Grav\Common\Grav;
 use Grav\Common\Utils;
 use Grav\Common\Yaml;
-use RocketTheme\Toolbox\Compat\Yaml\Yaml as FallbackYaml;
 
 class Validation
 {
@@ -90,7 +89,7 @@ class Validation
      */
     public static function filter($value, array $field)
     {
-        $validate = isset($field['validate']) ? (array) $field['validate'] : [];
+        $validate = (array)($field['validate'] ?? null);
 
         // If value isn't required, we will return null if empty value is given.
         if (($value === null || $value === '') && empty($validate['required'])) {
@@ -262,8 +261,8 @@ class Validation
      */
     public static function typeCheckbox($value, array $params, array $field)
     {
-        $value = (string) $value;
-        $field_value = (string) ($field['value'] ?? '1');
+        $value = (string)$value;
+        $field_value = (string)($field['value'] ?? '1');
 
         return $value === $field_value;
     }
@@ -304,12 +303,12 @@ class Validation
      */
     public static function typeFile($value, array $params, array $field)
     {
-        return self::typeArray((array) $value, $params, $field);
+        return self::typeArray((array)$value, $params, $field);
     }
 
     protected static function filterFile($value, array $params, array $field)
     {
-        return (array) $value;
+        return (array)$value;
     }
 
     /**
@@ -759,7 +758,7 @@ class Validation
 
     public static function validateInt($value, $params)
     {
-        return is_numeric($value) && (int) $value == $value;
+        return is_numeric($value) && (int)$value == $value;
     }
 
     protected static function filterInt($value, $params)
diff --git a/system/src/Grav/Common/Debugger.php b/system/src/Grav/Common/Debugger.php
index 3cb083b2d..cf5cde45c 100644
--- a/system/src/Grav/Common/Debugger.php
+++ b/system/src/Grav/Common/Debugger.php
@@ -270,7 +270,7 @@ class Debugger
      */
     public function startTimer($name, $description = null)
     {
-        if ($name[0] === '_' || $this->enabled()) {
+        if (strpos($name, '_') === 0 || $this->enabled()) {
             $this->debugbar['time']->startMeasure($name, $description);
             $this->timers[] = $name;
         }
@@ -287,7 +287,7 @@ class Debugger
      */
     public function stopTimer($name)
     {
-        if (\in_array($name, $this->timers, true) && ($name[0] === '_' || $this->enabled())) {
+        if (\in_array($name, $this->timers, true) && (strpos($name, '_') === 0 || $this->enabled())) {
             $this->debugbar['time']->stopMeasure($name);
         }
 
@@ -320,7 +320,7 @@ class Debugger
      */
     public function addException(\Exception $e)
     {
-        if ($this->enabled() && $this->initialized) {
+        if ($this->initialized && $this->enabled()) {
             $this->debugbar['exceptions']->addException($e);
         }
 
diff --git a/system/src/Grav/Common/Errors/Errors.php b/system/src/Grav/Common/Errors/Errors.php
index ee1ca4e50..49f64c13d 100644
--- a/system/src/Grav/Common/Errors/Errors.php
+++ b/system/src/Grav/Common/Errors/Errors.php
@@ -18,11 +18,11 @@ class Errors
     {
         $grav = Grav::instance();
         $config = $grav['config']->get('system.errors');
-        $jsonRequest = $_SERVER && isset($_SERVER['HTTP_ACCEPT']) && $_SERVER['HTTP_ACCEPT'] == 'application/json';
+        $jsonRequest = $_SERVER && isset($_SERVER['HTTP_ACCEPT']) && $_SERVER['HTTP_ACCEPT'] === 'application/json';
 
         // Setup Whoops-based error handler
         $system = new SystemFacade;
-        $whoops = new \Whoops\Run($system);
+        $whoops = new Whoops\Run($system);
 
         $verbosity = 1;
 
diff --git a/system/src/Grav/Common/Errors/SimplePageHandler.php b/system/src/Grav/Common/Errors/SimplePageHandler.php
index 0027aa5dd..f6a23e665 100644
--- a/system/src/Grav/Common/Errors/SimplePageHandler.php
+++ b/system/src/Grav/Common/Errors/SimplePageHandler.php
@@ -21,7 +21,7 @@ class SimplePageHandler extends Handler
     public function __construct()
     {
         // Add the default, local resource search path:
-        $this->searchPaths[] = __DIR__ . "/Resources";
+        $this->searchPaths[] = __DIR__ . '/Resources';
     }
 
     /**
@@ -32,8 +32,8 @@ class SimplePageHandler extends Handler
         $inspector = $this->getInspector();
 
         $helper = new TemplateHelper();
-        $templateFile = $this->getResource("layout.html.php");
-        $cssFile      = $this->getResource("error.css");
+        $templateFile = $this->getResource('layout.html.php');
+        $cssFile      = $this->getResource('error.css');
 
         $code = $inspector->getException()->getCode();
         if ( ($code >= 400) && ($code < 600) )
@@ -47,9 +47,9 @@ class SimplePageHandler extends Handler
         }
 
         $vars = array(
-            "stylesheet" => file_get_contents($cssFile),
-            "code"        => $code,
-            "message"     => filter_var(rawurldecode($message), FILTER_SANITIZE_STRING),
+            'stylesheet' => file_get_contents($cssFile),
+            'code'        => $code,
+            'message'     => filter_var(rawurldecode($message), FILTER_SANITIZE_STRING),
         );
 
         $helper->setVariables($vars);
@@ -75,7 +75,7 @@ class SimplePageHandler extends Handler
         // Search through available search paths, until we find the
         // resource we're after:
         foreach ($this->searchPaths as $path) {
-            $fullPath = $path . "/$resource";
+            $fullPath = "{$path}/{$resource}";
 
             if (is_file($fullPath)) {
                 // Cache the result:
diff --git a/system/src/Grav/Common/File/CompiledJsonFile.php b/system/src/Grav/Common/File/CompiledJsonFile.php
index f226679e5..d73e817b2 100644
--- a/system/src/Grav/Common/File/CompiledJsonFile.php
+++ b/system/src/Grav/Common/File/CompiledJsonFile.php
@@ -24,6 +24,6 @@ class CompiledJsonFile extends JsonFile
      */
     protected function decode($var, $assoc = true)
     {
-        return (array) json_decode($var, $assoc);
+        return (array)json_decode($var, $assoc);
     }
 }
diff --git a/system/src/Grav/Common/Filesystem/Archiver.php b/system/src/Grav/Common/Filesystem/Archiver.php
index 956643660..012c26053 100644
--- a/system/src/Grav/Common/Filesystem/Archiver.php
+++ b/system/src/Grav/Common/Filesystem/Archiver.php
@@ -20,11 +20,11 @@ abstract class Archiver
 
     public static function create($compression)
     {
-        if ($compression == 'zip') {
-            return new ZipArchiver();
-        } else {
+        if ($compression === 'zip') {
             return new ZipArchiver();
         }
+
+        return new ZipArchiver();
     }
 
     public function setArchive($archive_file)
diff --git a/system/src/Grav/Common/Filesystem/Folder.php b/system/src/Grav/Common/Filesystem/Folder.php
index db0224123..b65512e20 100644
--- a/system/src/Grav/Common/Filesystem/Folder.php
+++ b/system/src/Grav/Common/Filesystem/Folder.php
@@ -166,7 +166,7 @@ abstract class Folder
         $path = str_repeat('../', count($baseParts)) . implode('/', $pathParts);
 
         return '' === $path
-        || '/' === $path[0]
+        || strpos($path, '/') === 0
         || false !== ($colonPos = strpos($path, ':')) && ($colonPos < ($slashPos = strpos($path, '/')) || false === $slashPos)
             ? "./$path" : $path;
     }
@@ -201,14 +201,14 @@ abstract class Folder
         }
 
         $compare = isset($params['compare']) ? 'get' . $params['compare'] : null;
-        $pattern = isset($params['pattern']) ? $params['pattern'] : null;
-        $filters = isset($params['filters']) ? $params['filters'] : null;
-        $recursive = isset($params['recursive']) ? $params['recursive'] : true;
-        $levels = isset($params['levels']) ? $params['levels'] : -1;
+        $pattern = $params['pattern'] ?? null;
+        $filters = $params['filters'] ?? null;
+        $recursive = $params['recursive'] ?? true;
+        $levels = $params['levels'] ?? -1;
         $key = isset($params['key']) ? 'get' . $params['key'] : null;
-        $value = isset($params['value']) ? 'get' . $params['value'] : ($recursive ? 'getSubPathname' : 'getFilename');
-        $folders = isset($params['folders']) ? $params['folders'] : true;
-        $files = isset($params['files']) ? $params['files'] : true;
+        $value = 'get' . ($params['value'] ?? ($recursive ? 'SubPathname' : 'Filename'));
+        $folders = $params['folders'] ?? true;
+        $files = $params['files'] ?? true;
 
         /** @var UniformResourceLocator $locator */
         $locator = Grav::instance()['locator'];
@@ -235,7 +235,7 @@ abstract class Folder
         /** @var \RecursiveDirectoryIterator $file */
         foreach ($iterator as $file) {
             // Ignore hidden files.
-            if ($file->getFilename()[0] === '.') {
+            if (strpos($file->getFilename(), '.') === 0) {
                 continue;
             }
             if (!$folders && $file->isDir()) {
@@ -257,7 +257,7 @@ abstract class Folder
                 if (isset($filters['value'])) {
                     $filter = $filters['value'];
                     if (is_callable($filter)) {
-                        $filePath = call_user_func($filter, $file);
+                        $filePath = $filter($file);
                     } else {
                         $filePath = preg_replace($filter, '', $filePath);
                     }
diff --git a/system/src/Grav/Common/Filesystem/RecursiveFolderFilterIterator.php b/system/src/Grav/Common/Filesystem/RecursiveFolderFilterIterator.php
index 7f57c6ef0..3da995b12 100644
--- a/system/src/Grav/Common/Filesystem/RecursiveFolderFilterIterator.php
+++ b/system/src/Grav/Common/Filesystem/RecursiveFolderFilterIterator.php
@@ -42,9 +42,6 @@ class RecursiveFolderFilterIterator extends \RecursiveFilterIterator
         /** @var $current \SplFileInfo */
         $current = $this->current();
 
-        if ($current->isDir() && !in_array($current->getFilename(), $this::$ignore_folders, true)) {
-            return true;
-        }
-        return false;
+        return $current->isDir() && !in_array($current->getFilename(), $this::$ignore_folders, true);
     }
 }
diff --git a/system/src/Grav/Common/GPM/Common/CachedCollection.php b/system/src/Grav/Common/GPM/Common/CachedCollection.php
index 3d0633d50..b3450127b 100644
--- a/system/src/Grav/Common/GPM/Common/CachedCollection.php
+++ b/system/src/Grav/Common/GPM/Common/CachedCollection.php
@@ -18,11 +18,11 @@ class CachedCollection extends Iterator {
     public function __construct($items)
     {
         // local cache to speed things up
-        if (!isset(self::$cache[get_called_class().__METHOD__])) {
-            self::$cache[get_called_class().__METHOD__] = $items;
+        if (!isset(self::$cache[get_called_class() . __METHOD__])) {
+            self::$cache[get_called_class() . __METHOD__] = $items;
         }
 
-        foreach (self::$cache[get_called_class().__METHOD__] as $name => $item) {
+        foreach (self::$cache[get_called_class() . __METHOD__] as $name => $item) {
             $this->append([$name => $item]);
         }
     }
diff --git a/system/src/Grav/Common/GPM/Common/Package.php b/system/src/Grav/Common/GPM/Common/Package.php
index 155a20973..dc799adf9 100644
--- a/system/src/Grav/Common/GPM/Common/Package.php
+++ b/system/src/Grav/Common/GPM/Common/Package.php
@@ -15,7 +15,8 @@ class Package {
 
     protected $data;
 
-    public function __construct(Data $package, $type = null) {
+    public function __construct(Data $package, $type = null)
+    {
         $this->data = $package;
 
         if ($type) {
@@ -23,27 +24,38 @@ class Package {
         }
     }
 
-    public function getData() {
+    public function getData()
+    {
         return $this->data;
     }
 
-    public function __get($key) {
+    public function __get($key)
+    {
         return $this->data->get($key);
     }
 
-    public function __isset($key) {
-        return isset($this->data->$key);
+    public function __set($key, $value)
+    {
+        throw new $this->data->set($key, $value);
     }
 
-    public function __toString() {
+    public function __isset($key)
+    {
+        return isset($this->data->{$key});
+    }
+
+    public function __toString()
+    {
         return $this->toJson();
     }
 
-    public function toJson() {
+    public function toJson()
+    {
         return $this->data->toJson();
     }
 
-    public function toArray() {
+    public function toArray()
+    {
         return $this->data->toArray();
     }
 }
diff --git a/system/src/Grav/Common/GPM/GPM.php b/system/src/Grav/Common/GPM/GPM.php
index 6319f6af2..43d0ed5de 100644
--- a/system/src/Grav/Common/GPM/GPM.php
+++ b/system/src/Grav/Common/GPM/GPM.php
@@ -323,7 +323,7 @@ class GPM extends Iterator
                 continue;
             }
 
-            $local_version = $plugin->version ? $plugin->version : 'Unknown';
+            $local_version = $plugin->version ?: 'Unknown';
             $remote_version = $repository[$slug]->version;
 
             if (version_compare($local_version, $remote_version) < 0) {
@@ -565,31 +565,33 @@ class GPM extends Iterator
             file_exists($source . 'system/config/system.yaml')
         ) {
             return 'grav';
-        } else {
-            // must have a blueprint
-            if (!file_exists($source . 'blueprints.yaml')) {
-                return false;
-            }
+        }
 
-            // either theme or plugin
-            $name = basename($source);
-            if (Utils::contains($name, 'theme')) {
-                return 'theme';
-            } elseif (Utils::contains($name, 'plugin')) {
-                return 'plugin';
-            }
-            foreach (glob($source . "*.php") as $filename) {
-                $contents = file_get_contents($filename);
-                if (preg_match($theme_regex, $contents)) {
-                    return 'theme';
-                } elseif (preg_match($plugin_regex, $contents)) {
-                    return 'plugin';
-                }
-            }
+        // must have a blueprint
+        if (!file_exists($source . 'blueprints.yaml')) {
+            return false;
+        }
 
-            // Assume it's a theme
+        // either theme or plugin
+        $name = basename($source);
+        if (Utils::contains($name, 'theme')) {
             return 'theme';
         }
+        if (Utils::contains($name, 'plugin')) {
+            return 'plugin';
+        }
+        foreach (glob($source . '*.php') as $filename) {
+            $contents = file_get_contents($filename);
+            if (preg_match($theme_regex, $contents)) {
+                return 'theme';
+            }
+            if (preg_match($plugin_regex, $contents)) {
+                return 'plugin';
+            }
+        }
+
+        // Assume it's a theme
+        return 'theme';
     }
 
     /**
@@ -602,7 +604,7 @@ class GPM extends Iterator
     {
         $ignore_yaml_files = ['blueprints', 'languages'];
 
-        foreach (glob($source . "*.yaml") as $filename) {
+        foreach (glob($source . '*.yaml') as $filename) {
             $name = strtolower(basename($filename, '.yaml'));
             if (in_array($name, $ignore_yaml_files)) {
                 continue;
@@ -846,7 +848,7 @@ class GPM extends Iterator
                         $current_php_version) === 1
                 ) {
                     //Needs a Grav update first
-                    throw new \Exception("<red>One of the packages require PHP " . $dependencies['php'] . ". Please update PHP to resolve this");
+                    throw new \RuntimeException("<red>One of the packages require PHP {$dependencies['php']}. Please update PHP to resolve this");
                 } else {
                     unset($dependencies[$dependency_slug]);
                     continue;
@@ -859,7 +861,7 @@ class GPM extends Iterator
                         GRAV_VERSION) === 1
                 ) {
                     //Needs a Grav update first
-                    throw new \Exception("<red>One of the packages require Grav " . $dependencies['grav'] . ". Please update Grav to the latest release.");
+                    throw new \RuntimeException("<red>One of the packages require Grav {$dependencies['grav']}. Please update Grav to the latest release.");
                 } else {
                     unset($dependencies[$dependency_slug]);
                     continue;
@@ -889,7 +891,7 @@ class GPM extends Iterator
                             $currentlyInstalledVersion);
 
                         if (!$compatible) {
-                            throw new \Exception('Dependency <cyan>' . $dependency_slug . '</cyan> is required in an older version than the one installed. This package must be updated. Please get in touch with its developer.',
+                            throw new \RuntimeException('Dependency <cyan>' . $dependency_slug . '</cyan> is required in an older version than the one installed. This package must be updated. Please get in touch with its developer.',
                                 2);
                         }
                     }
@@ -900,7 +902,7 @@ class GPM extends Iterator
 
                 if ($this->firstVersionIsLower($latestRelease, $dependencyVersion)) {
                     //throw an exception if a required version cannot be found in the GPM yet
-                    throw new \Exception('Dependency <cyan>' . $package_yaml['name'] . '</cyan> is required in version <cyan>' . $dependencyVersion . '</cyan> which is higher than the latest release, <cyan>' . $latestRelease . '</cyan>. Try running `bin/gpm -f index` to force a refresh of the GPM cache',
+                    throw new \RuntimeException('Dependency <cyan>' . $package_yaml['name'] . '</cyan> is required in version <cyan>' . $dependencyVersion . '</cyan> which is higher than the latest release, <cyan>' . $latestRelease . '</cyan>. Try running `bin/gpm -f index` to force a refresh of the GPM cache',
                         1);
                 }
 
@@ -1006,7 +1008,7 @@ class GPM extends Iterator
 
                         $current_package_version_number = $this->calculateVersionNumberFromDependencyVersion($current_package_version_information);
                         if (!$current_package_version_number) {
-                            throw new \Exception('Bad format for version of dependency ' . $current_package_name . ' for package ' . $packageName,
+                            throw new \RuntimeException('Bad format for version of dependency ' . $current_package_name . ' for package ' . $packageName,
                                 1);
                         }
 
@@ -1030,7 +1032,7 @@ class GPM extends Iterator
                                 $compatible = $this->checkNextSignificantReleasesAreCompatible($currently_stored_version_number,
                                     $current_package_version_number);
                                 if (!$compatible) {
-                                    throw new \Exception('Dependency ' . $current_package_name . ' is required in two incompatible versions',
+                                    throw new \RuntimeException('Dependency ' . $current_package_name . ' is required in two incompatible versions',
                                         2);
                                 }
                             }
@@ -1077,17 +1079,19 @@ class GPM extends Iterator
      */
     public function calculateVersionNumberFromDependencyVersion($version)
     {
-        if ($version == '*') {
+        if ($version === '*') {
             return null;
-        } elseif ($version == '') {
-            return null;
-        } elseif ($this->versionFormatIsNextSignificantRelease($version)) {
-            return trim(substr($version, 1));
-        } elseif ($this->versionFormatIsEqualOrHigher($version)) {
-            return trim(substr($version, 2));
-        } else {
-            return $version;
         }
+        if ($version === '') {
+            return null;
+        }
+        if ($this->versionFormatIsNextSignificantRelease($version)) {
+            return trim(substr($version, 1));
+        }
+        if ($this->versionFormatIsEqualOrHigher($version)) {
+            return trim(substr($version, 2));
+        }
+        return $version;
     }
 
     /**
@@ -1101,7 +1105,7 @@ class GPM extends Iterator
      */
     public function versionFormatIsNextSignificantRelease($version)
     {
-        return substr($version, 0, 1) == '~';
+        return strpos($version, '~') === 0;
     }
 
     /**
@@ -1115,7 +1119,7 @@ class GPM extends Iterator
      */
     public function versionFormatIsEqualOrHigher($version)
     {
-        return substr($version, 0, 2) == '>=';
+        return strpos($version, '>=') === 0;
     }
 
     /**
@@ -1136,12 +1140,12 @@ class GPM extends Iterator
         $version1array = explode('.', $version1);
         $version2array = explode('.', $version2);
 
-        if (count($version1array) > count($version2array)) {
+        if (\count($version1array) > \count($version2array)) {
             list($version1array, $version2array) = [$version2array, $version1array];
         }
 
         $i = 0;
-        while ($i < count($version1array) - 1) {
+        while ($i < \count($version1array) - 1) {
             if ($version1array[$i] != $version2array[$i]) {
                 return false;
             }
diff --git a/system/src/Grav/Common/GPM/Installer.php b/system/src/Grav/Common/GPM/Installer.php
index 4efc76086..8548ff4f6 100644
--- a/system/src/Grav/Common/GPM/Installer.php
+++ b/system/src/Grav/Common/GPM/Installer.php
@@ -15,23 +15,23 @@ use Grav\Common\Grav;
 class Installer
 {
     /** @const No error */
-    const OK = 0;
+    public const OK = 0;
     /** @const Target already exists */
-    const EXISTS = 1;
+    public const EXISTS = 1;
     /** @const Target is a symbolic link */
-    const IS_LINK = 2;
+    public const IS_LINK = 2;
     /** @const Target doesn't exist */
-    const NOT_FOUND = 4;
+    public const NOT_FOUND = 4;
     /** @const Target is not a directory */
-    const NOT_DIRECTORY = 8;
+    public const NOT_DIRECTORY = 8;
     /** @const Target is not a Grav instance */
-    const NOT_GRAV_ROOT = 16;
+    public const NOT_GRAV_ROOT = 16;
     /** @const Error while trying to open the ZIP package */
-    const ZIP_OPEN_ERROR = 32;
+    public const ZIP_OPEN_ERROR = 32;
     /** @const Error while trying to extract the ZIP package */
-    const ZIP_EXTRACT_ERROR = 64;
+    public const ZIP_EXTRACT_ERROR = 64;
     /** @const Invalid source file */
-    const INVALID_SOURCE = 128;
+    public const INVALID_SOURCE = 128;
 
     /**
      * Destination folder on which validation checks are applied
@@ -190,9 +190,8 @@ class Installer
 
             $package_folder_name = preg_replace('#\./$#', '', $zip->getNameIndex(0));
             $zip->close();
-            $extracted_folder = $destination . '/' . $package_folder_name;
 
-            return $extracted_folder;
+            return $destination . '/' . $package_folder_name;
         }
 
         self::$error = self::ZIP_EXTRACT_ERROR;
@@ -217,7 +216,7 @@ class Installer
         $install_file = $installer_file_folder . DS . 'install.php';
 
         if (file_exists($install_file)) {
-            require_once($install_file);
+            require_once $install_file;
         } else {
             return null;
         }
@@ -280,10 +279,10 @@ class Installer
     {
         if (empty($source_path)) {
             throw new \RuntimeException("Directory $source_path is missing");
-        } else {
-            Folder::rcopy($source_path, $install_path);
         }
 
+        Folder::rcopy($source_path, $install_path);
+
         return true;
     }
 
@@ -297,7 +296,7 @@ class Installer
     {
         foreach (new \DirectoryIterator($source_path) as $file) {
 
-            if ($file->isLink() || $file->isDot() || in_array($file->getFilename(), $ignores)) {
+            if ($file->isLink() || $file->isDot() || \in_array($file->getFilename(), $ignores, true)) {
                 continue;
             }
 
@@ -390,7 +389,7 @@ class Installer
             return true;
         }
 
-        return !(self::$error);
+        return !self::$error;
     }
 
     /**
@@ -470,23 +469,23 @@ class Installer
                 if (self::$error_zip) {
                     switch(self::$error_zip) {
                         case \ZipArchive::ER_EXISTS:
-                            $msg .= "File already exists.";
+                            $msg .= 'File already exists.';
                             break;
 
                         case \ZipArchive::ER_INCONS:
-                            $msg .= "Zip archive inconsistent.";
+                            $msg .= 'Zip archive inconsistent.';
                             break;
 
                         case \ZipArchive::ER_MEMORY:
-                            $msg .= "Malloc failure.";
+                            $msg .= 'Memory allocation failure.';
                             break;
 
                         case \ZipArchive::ER_NOENT:
-                            $msg .= "No such file.";
+                            $msg .= 'No such file.';
                             break;
 
                         case \ZipArchive::ER_NOZIP:
-                            $msg .= "Not a zip archive.";
+                            $msg .= 'Not a zip archive.';
                             break;
 
                         case \ZipArchive::ER_OPEN:
@@ -494,11 +493,11 @@ class Installer
                             break;
 
                         case \ZipArchive::ER_READ:
-                            $msg .= "Read error.";
+                            $msg .= 'Read error.';
                             break;
 
                         case \ZipArchive::ER_SEEK:
-                            $msg .= "Seek error.";
+                            $msg .= 'Seek error.';
                             break;
                     }
                 }
diff --git a/system/src/Grav/Common/GPM/Licenses.php b/system/src/Grav/Common/GPM/Licenses.php
index aefc8a7b4..cd596a214 100644
--- a/system/src/Grav/Common/GPM/Licenses.php
+++ b/system/src/Grav/Common/GPM/Licenses.php
@@ -41,14 +41,14 @@ class Licenses
     public static function set($slug, $license)
     {
         $licenses = self::getLicenseFile();
-        $data = $licenses->content();
+        $data = (array)$licenses->content();
         $slug = strtolower($slug);
 
         if ($license && !self::validate($license)) {
             return false;
         }
 
-        if (!is_string($license)) {
+        if (!\is_string($license)) {
             if (isset($data['licenses'][$slug])) {
                 unset($data['licenses'][$slug]);
             } else {
@@ -74,19 +74,15 @@ class Licenses
     public static function get($slug = null)
     {
         $licenses = self::getLicenseFile();
-        $data = $licenses->content();
+        $data = (array)$licenses->content();
         $licenses->free();
         $slug = strtolower($slug);
 
         if (!$slug) {
-            return isset($data['licenses']) ? $data['licenses'] : [];
+            return $data['licenses'] ?? [];
         }
 
-        if (!isset($data['licenses']) || !isset($data['licenses'][$slug])) {
-            return '';
-        }
-
-        return $data['licenses'][$slug];
+        return $data['licenses'][$slug] ?? '';
     }
 
 
diff --git a/system/src/Grav/Common/GPM/Remote/GravCore.php b/system/src/Grav/Common/GPM/Remote/GravCore.php
index 1b67f1efe..291fcb5dd 100644
--- a/system/src/Grav/Common/GPM/Remote/GravCore.php
+++ b/system/src/Grav/Common/GPM/Remote/GravCore.php
@@ -123,7 +123,7 @@ class GravCore extends AbstractPackageCollection
     public function getMinPHPVersion()
     {
         // If non min set, assume current PHP version
-        if (is_null($this->min_php)) {
+        if (null === $this->min_php) {
             $this->min_php = phpversion();
         }
         return $this->min_php;
diff --git a/system/src/Grav/Common/GPM/Remote/Package.php b/system/src/Grav/Common/GPM/Remote/Package.php
index 22b17b387..749851d76 100644
--- a/system/src/Grav/Common/GPM/Remote/Package.php
+++ b/system/src/Grav/Common/GPM/Remote/Package.php
@@ -12,8 +12,10 @@ namespace Grav\Common\GPM\Remote;
 use Grav\Common\Data\Data;
 use Grav\Common\GPM\Common\Package as BasePackage;
 
-class Package extends BasePackage {
-    public function __construct($package, $package_type = null) {
+class Package extends BasePackage
+{
+    public function __construct($package, $package_type = null)
+    {
         $data = new Data($package);
         parent::__construct($data, $package_type);
     }
diff --git a/system/src/Grav/Common/GPM/Response.php b/system/src/Grav/Common/GPM/Response.php
index 6fb621152..1d2985b61 100644
--- a/system/src/Grav/Common/GPM/Response.php
+++ b/system/src/Grav/Common/GPM/Response.php
@@ -78,7 +78,7 @@ class Response
      */
     public static function setMethod($method = 'auto')
     {
-        if (!in_array($method, ['auto', 'curl', 'fopen'])) {
+        if (!\in_array($method, ['auto', 'curl', 'fopen'], true)) {
             $method = 'auto';
         }
 
@@ -166,7 +166,7 @@ class Response
                 $overrides['curl'][CURLOPT_PROXYPORT] = $proxy['port'];
             }
 
-            if (isset($proxy['user']) && isset($proxy['pass'])) {
+            if (isset($proxy['user'], $proxy['pass'])) {
                 $fopen_auth = $auth = base64_encode($proxy['user'] . ':' . $proxy['pass']);
                 $overrides['curl'][CURLOPT_PROXYUSERPWD] = $proxy['user'] . ':' . $proxy['pass'];
                 $overrides['fopen']['header'] = "Proxy-Authorization: Basic $fopen_auth";
@@ -220,7 +220,7 @@ class Response
         static $filesize = null;
 
         $args           = func_get_args();
-        $isCurlResource = is_resource($args[0]) && get_resource_type($args[0]) == 'curl';
+        $isCurlResource = is_resource($args[0]) && get_resource_type($args[0]) === 'curl';
 
         $notification_code = !$isCurlResource ? $args[0] : false;
         $bytes_transferred = $isCurlResource ? $args[2] : $args[4];
@@ -242,7 +242,7 @@ class Response
                 ];
 
                 if (self::$callback !== null) {
-                    call_user_func_array(self::$callback, [$progress]);
+                    call_user_func(self::$callback, $progress);
                 }
             }
         }
@@ -273,7 +273,7 @@ class Response
      */
     private static function getFopen()
     {
-        if (count($args = func_get_args()) == 1) {
+        if (\count($args = func_get_args()) === 1) {
             $args = $args[0];
         }
 
@@ -308,11 +308,11 @@ class Response
 
             switch ($code) {
                 case '404':
-                    throw new \RuntimeException("Page not found");
+                    throw new \RuntimeException('Page not found');
                 case '401':
-                    throw new \RuntimeException("Invalid LICENSE");
+                    throw new \RuntimeException('Invalid LICENSE');
                 default:
-                    throw new \RuntimeException("Error while trying to download (code: $code): $uri \n");
+                    throw new \RuntimeException("Error while trying to download (code: {$code}): {$uri}\n");
             }
         }
 
@@ -382,7 +382,7 @@ class Response
             return curl_exec($ch);
         }
 
-        $max_redirects = isset($options['curl'][CURLOPT_MAXREDIRS]) ? $options['curl'][CURLOPT_MAXREDIRS] : 5;
+        $max_redirects = $options['curl'][CURLOPT_MAXREDIRS] ?? 5;
         $options['curl'][CURLOPT_FOLLOWLOCATION] = false;
 
         // open_basedir set but no redirects to follow, we can disable followlocation and proceed normally
@@ -406,8 +406,8 @@ class Response
             if (curl_errno($rch)) {
                 $code = 0;
             } else {
-                $code = curl_getinfo($rch, CURLINFO_HTTP_CODE);
-                if ($code == 301 || $code == 302 || $code == 303) {
+                $code = (int)curl_getinfo($rch, CURLINFO_HTTP_CODE);
+                if ($code === 301 || $code === 302 || $code === 303) {
                     preg_match('/Location:(.*?)\n/', $header, $matches);
                     $uri = trim(array_pop($matches));
                 } else {
diff --git a/system/src/Grav/Common/GPM/Upgrader.php b/system/src/Grav/Common/GPM/Upgrader.php
index 3b7fc6a11..5d9406d5a 100644
--- a/system/src/Grav/Common/GPM/Upgrader.php
+++ b/system/src/Grav/Common/GPM/Upgrader.php
@@ -113,7 +113,7 @@ class Upgrader
      */
     public function minPHPVersion()
     {
-        if (is_null($this->min_php)) {
+        if (null === $this->min_php) {
             $this->min_php = $this->remote->getMinPHPVersion();
         }
         return $this->min_php;
@@ -126,7 +126,7 @@ class Upgrader
      */
     public function isUpgradable()
     {
-        return version_compare($this->getLocalVersion(), $this->getRemoteVersion(), "<");
+        return version_compare($this->getLocalVersion(), $this->getRemoteVersion(), '<');
     }
 
     /**
diff --git a/system/src/Grav/Common/Getters.php b/system/src/Grav/Common/Getters.php
index 05c0b04d9..e69116e15 100644
--- a/system/src/Grav/Common/Getters.php
+++ b/system/src/Grav/Common/Getters.php
@@ -74,9 +74,9 @@ abstract class Getters implements \ArrayAccess, \Countable
             $var = $this->gettersVariable;
 
             return isset($this->{$var}[$offset]);
-        } else {
-            return isset($this->{$offset});
         }
+
+        return isset($this->{$offset});
     }
 
     /**
@@ -89,10 +89,10 @@ abstract class Getters implements \ArrayAccess, \Countable
         if ($this->gettersVariable) {
             $var = $this->gettersVariable;
 
-            return isset($this->{$var}[$offset]) ? $this->{$var}[$offset] : null;
-        } else {
-            return isset($this->{$offset}) ? $this->{$offset} : null;
+            return $this->{$var}[$offset] ?? null;
         }
+
+        return $this->{$offset} ?? null;
     }
 
     /**
@@ -129,10 +129,10 @@ abstract class Getters implements \ArrayAccess, \Countable
     {
         if ($this->gettersVariable) {
             $var = $this->gettersVariable;
-            count($this->{$var});
-        } else {
-            count($this->toArray());
+            return \count($this->{$var});
         }
+
+        return \count($this->toArray());
     }
 
     /**
@@ -146,16 +146,16 @@ abstract class Getters implements \ArrayAccess, \Countable
             $var = $this->gettersVariable;
 
             return $this->{$var};
-        } else {
-            $properties = (array)$this;
-            $list = [];
-            foreach ($properties as $property => $value) {
-                if ($property[0] != "\0") {
-                    $list[$property] = $value;
-                }
-            }
-
-            return $list;
         }
+
+        $properties = (array)$this;
+        $list = [];
+        foreach ($properties as $property => $value) {
+            if ($property[0] !== "\0") {
+                $list[$property] = $value;
+            }
+        }
+
+        return $list;
     }
 }
diff --git a/system/src/Grav/Common/Helpers/Base32.php b/system/src/Grav/Common/Helpers/Base32.php
index ae6869d50..8305908a9 100644
--- a/system/src/Grav/Common/Helpers/Base32.php
+++ b/system/src/Grav/Common/Helpers/Base32.php
@@ -33,7 +33,7 @@ class Base32
      */
     public static function encode($bytes)
     {
-        $i = 0; $index = 0; $digit = 0;
+        $i = 0; $index = 0;
         $base32 = '';
         $bytesLen = \strlen($bytes);
 
diff --git a/system/src/Grav/Common/Helpers/Excerpts.php b/system/src/Grav/Common/Helpers/Excerpts.php
index 248e8b811..1716c22e6 100644
--- a/system/src/Grav/Common/Helpers/Excerpts.php
+++ b/system/src/Grav/Common/Helpers/Excerpts.php
@@ -204,7 +204,7 @@ class Excerpts
         $filename = null;
 
         if (!empty($url_parts['stream'])) {
-            $filename = $url_parts['scheme'] . '://' . (isset($url_parts['path']) ? $url_parts['path'] : '');
+            $filename = $url_parts['scheme'] . '://' . ($url_parts['path'] ?? '');
 
             $media = $page->media();
 
@@ -248,10 +248,10 @@ class Excerpts
             $medium = static::processMediaActions($medium, $url_parts);
             $element_excerpt = $excerpt['element']['attributes'];
 
-            $alt = isset($element_excerpt['alt']) ? $element_excerpt['alt'] : '';
-            $title = isset($element_excerpt['title']) ? $element_excerpt['title'] : '';
-            $class = isset($element_excerpt['class']) ? $element_excerpt['class'] : '';
-            $id = isset($element_excerpt['id']) ? $element_excerpt['id'] : '';
+            $alt = $element_excerpt['alt'] ?? '';
+            $title = $element_excerpt['title'] ?? '';
+            $class = $element_excerpt['class'] ?? '';
+            $id = $element_excerpt['id'] ?? '';
 
             $excerpt['element'] = $medium->parsedownElement($title, $alt, $class, $id, true);
 
@@ -284,7 +284,7 @@ class Excerpts
         if (isset($url_parts['query'])) {
             $actions = array_reduce(explode('&', $url_parts['query']), function ($carry, $item) {
                 $parts = explode('=', $item, 2);
-                $value = isset($parts[1]) ? $parts[1] : null;
+                $value = $parts[1] ?? null;
                 $carry[] = ['method' => $parts[0], 'params' => $value];
 
                 return $carry;
@@ -358,6 +358,10 @@ class Excerpts
         /** @var UniformResourceLocator $locator */
         $locator = Grav::instance()['locator'];
 
-        return $locator->isStream($url) ? ($locator->findResource($url, false) ?: $locator->findResource($url, false, true)) : $url;
+        if ($locator->isStream($url)) {
+            return $locator->findResource($url, false) ?: $locator->findResource($url, false, true);
+        }
+
+        return $url;
     }
 }
diff --git a/system/src/Grav/Common/Helpers/Exif.php b/system/src/Grav/Common/Helpers/Exif.php
index a30a14c6d..15aff6677 100644
--- a/system/src/Grav/Common/Helpers/Exif.php
+++ b/system/src/Grav/Common/Helpers/Exif.php
@@ -10,7 +10,6 @@
 namespace Grav\Common\Helpers;
 
 use Grav\Common\Grav;
-use SebastianBergmann\GlobalState\RuntimeException;
 
 class Exif
 {
diff --git a/system/src/Grav/Common/Helpers/Truncator.php b/system/src/Grav/Common/Helpers/Truncator.php
index dba144773..035a85512 100644
--- a/system/src/Grav/Common/Helpers/Truncator.php
+++ b/system/src/Grav/Common/Helpers/Truncator.php
@@ -44,7 +44,7 @@ class Truncator {
         $dom = self::htmlToDomDocument($html);
 
         // Grab the body of our DOM.
-        $body = $dom->getElementsByTagName("body")->item(0);
+        $body = $dom->getElementsByTagName('body')->item(0);
 
         // Iterate over words.
         $words = new DOMWordsIterator($body);
@@ -82,9 +82,9 @@ class Truncator {
         // Return original HTML if not truncated.
         if ($truncated) {
             return self::innerHTML($body);
-        } else {
-            return $html;
         }
+
+        return $html;
     }
 
     /**
@@ -94,7 +94,7 @@ class Truncator {
      * @param  string  $ellipsis String to use as ellipsis (if any).
      * @return string            Safe truncated HTML.
      */
-    public static function truncateLetters($html, $limit = 0, $ellipsis = "")
+    public static function truncateLetters($html, $limit = 0, $ellipsis = '')
     {
         if ($limit <= 0) {
             return $html;
@@ -130,9 +130,9 @@ class Truncator {
         // Return original HTML if not truncated.
         if ($truncated) {
             return self::innerHTML($body);
-        } else {
-            return $html;
         }
+
+        return $html;
     }
 
     /**
diff --git a/system/src/Grav/Common/Inflector.php b/system/src/Grav/Common/Inflector.php
index 8f1072af7..c7e0c9ee0 100644
--- a/system/src/Grav/Common/Inflector.php
+++ b/system/src/Grav/Common/Inflector.php
@@ -9,8 +9,6 @@
 
 namespace Grav\Common;
 
-use Grav\Common\Grav;
-
 /**
 * This file was originally part of the Akelos Framework
 */
@@ -47,7 +45,7 @@ class Inflector
     {
         static::init();
 
-        if ($count == 1) {
+        if ((int)$count === 1) {
             return $word;
         }
 
@@ -87,7 +85,7 @@ class Inflector
     {
         static::init();
 
-        if ($count != 1) {
+        if ((int)$count !== 1) {
             return $word;
         }
 
@@ -132,7 +130,7 @@ class Inflector
      */
     public static function titleize($word, $uppercase = '')
     {
-        $uppercase = $uppercase == 'first' ? 'ucfirst' : 'ucwords';
+        $uppercase = $uppercase === 'first' ? 'ucfirst' : 'ucwords';
 
         return $uppercase(static::humanize(static::underscorize($word)));
     }
@@ -216,7 +214,7 @@ class Inflector
      */
     public static function humanize($word, $uppercase = '')
     {
-        $uppercase = $uppercase == 'all' ? 'ucwords' : 'ucfirst';
+        $uppercase = $uppercase === 'all' ? 'ucwords' : 'ucfirst';
 
         return $uppercase(str_replace('_', ' ', preg_replace('/_id$/', '', $word)));
     }
@@ -290,21 +288,17 @@ class Inflector
 
         if (in_array(($number % 100), range(11, 13))) {
             return $number . static::$ordinals['default'];
-        } else {
-            switch (($number % 10)) {
-                case 1:
-                    return $number . static::$ordinals['first'];
-                    break;
-                case 2:
-                    return $number . static::$ordinals['second'];
-                    break;
-                case 3:
-                    return $number . static::$ordinals['third'];
-                    break;
-                default:
-                    return $number . static::$ordinals['default'];
-                    break;
-            }
+        }
+
+        switch ($number % 10) {
+            case 1:
+                return $number . static::$ordinals['first'];
+            case 2:
+                return $number . static::$ordinals['second'];
+            case 3:
+                return $number . static::$ordinals['third'];
+            default:
+                return $number . static::$ordinals['default'];
         }
     }
 
@@ -326,7 +320,7 @@ class Inflector
 
         // handle years
         if ($diff->y > 0) {
-            $diff->m = $diff->m + 12 * $diff->y;
+            $diff->m += 12 * $diff->y;
         }
 
         return $diff->m;
diff --git a/system/src/Grav/Common/Language/Language.php b/system/src/Grav/Common/Language/Language.php
index f3f0ee788..82e14ccdd 100644
--- a/system/src/Grav/Common/Language/Language.php
+++ b/system/src/Grav/Common/Language/Language.php
@@ -106,7 +106,7 @@ class Language
      */
     public function getLanguage()
     {
-        return $this->active ? $this->active : $this->default;
+        return $this->active ?: $this->default;
     }
 
     /**
@@ -315,7 +315,8 @@ class Language
      * $this->grav['pages']->init();
      * ```
      */
-    public function resetFallbackPageExtensions() {
+    public function resetFallbackPageExtensions()
+    {
         $this->page_extensions = null;
     }
 
diff --git a/system/src/Grav/Common/Language/LanguageCodes.php b/system/src/Grav/Common/Language/LanguageCodes.php
index 229d4832c..780df7c02 100644
--- a/system/src/Grav/Common/Language/LanguageCodes.php
+++ b/system/src/Grav/Common/Language/LanguageCodes.php
@@ -180,10 +180,7 @@ class LanguageCodes
 
     public static function isRtl($code)
     {
-        if (static::getOrientation($code) === 'rtl') {
-            return true;
-        }
-        return false;
+        return static::getOrientation($code) === 'rtl';
     }
 
     public static function getNames(array $keys)
diff --git a/system/src/Grav/Common/Page/Collection.php b/system/src/Grav/Common/Page/Collection.php
index 7b2ca73aa..7e25c643b 100644
--- a/system/src/Grav/Common/Page/Collection.php
+++ b/system/src/Grav/Common/Page/Collection.php
@@ -204,7 +204,7 @@ class Collection extends Iterator
         if ($key instanceof Page) {
             $key = $key->path();
         } elseif (null === $key) {
-            $key = key($this->items);
+            $key = (string)key($this->items);
         }
         if (!\is_string($key)) {
             throw new \InvalidArgumentException('Invalid argument $key.');
diff --git a/system/src/Grav/Common/Page/Media.php b/system/src/Grav/Common/Page/Media.php
index 32864f952..a284726e0 100644
--- a/system/src/Grav/Common/Page/Media.php
+++ b/system/src/Grav/Common/Page/Media.php
@@ -89,21 +89,21 @@ class Media extends AbstractMedia
         /** @var \DirectoryIterator $info */
         foreach ($iterator as $path => $info) {
             // Ignore folders and Markdown files.
-            if (!$info->isFile() || $info->getExtension() === 'md' || $info->getFilename()[0] === '.') {
+            if (!$info->isFile() || $info->getExtension() === 'md' || strpos($info->getFilename(), '.') === 0) {
                 continue;
             }
 
             // Find out what type we're dealing with
             list($basename, $ext, $type, $extra) = $this->getFileParts($info->getFilename());
 
-            if (!in_array(strtolower($ext), $media_types)) {
+            if (!\in_array(strtolower($ext), $media_types, true)) {
                 continue;
             }
 
             if ($type === 'alternative') {
-                $media["{$basename}.{$ext}"][$type][$extra] = [ 'file' => $path, 'size' => $info->getSize() ];
+                $media["{$basename}.{$ext}"][$type][$extra] = ['file' => $path, 'size' => $info->getSize()];
             } else {
-                $media["{$basename}.{$ext}"][$type] = [ 'file' => $path, 'size' => $info->getSize() ];
+                $media["{$basename}.{$ext}"][$type] = ['file' => $path, 'size' => $info->getSize()];
             }
         }
 
@@ -148,7 +148,7 @@ class Media extends AbstractMedia
 
             if (file_exists($meta_path)) {
                 $types['meta']['file'] = $meta_path;
-            } elseif ($file_path && $medium->get('mime') === 'image/jpeg' && empty($types['meta']) && $config->get('system.media.auto_metadata_exif') && $exif_reader) {
+            } elseif ($file_path && $exif_reader && $medium->get('mime') === 'image/jpeg' && empty($types['meta']) && $config->get('system.media.auto_metadata_exif')) {
 
                 $meta = $exif_reader->read($file_path);
 
diff --git a/system/src/Grav/Common/Page/Medium/AudioMedium.php b/system/src/Grav/Common/Page/Medium/AudioMedium.php
index 027b81a94..87786ee8a 100644
--- a/system/src/Grav/Common/Page/Medium/AudioMedium.php
+++ b/system/src/Grav/Common/Page/Medium/AudioMedium.php
@@ -39,14 +39,12 @@ class AudioMedium extends Medium
      */
     public function controls($display = true)
     {
-        if($display)
-        {
+        if($display) {
             $this->attributes['controls'] = true;
-        }
-        else
-        {
+        } else {
             unset($this->attributes['controls']);
         }
+
         return $this;
     }
 
@@ -58,12 +56,12 @@ class AudioMedium extends Medium
      */
     public function preload($preload)
     {
-        $validPreloadAttrs = array('auto','metadata','none');
+        $validPreloadAttrs = ['auto', 'metadata', 'none'];
         
-        if (in_array($preload, $validPreloadAttrs))
-        {
+        if (\in_array($preload, $validPreloadAttrs, true)) {
             $this->attributes['preload'] = $preload;
         }
+
         return $this;
     }
 
@@ -78,6 +76,7 @@ class AudioMedium extends Medium
     {
         $controlsList = str_replace('-', ' ', $controlsList);
         $this->attributes['controlsList'] = $controlsList;
+
         return $this;
     }
 
@@ -89,14 +88,12 @@ class AudioMedium extends Medium
      */
     public function muted($status = false)
     {
-        if($status)
-        {
+        if($status) {
             $this->attributes['muted'] = true;
-        }
-        else
-        {
+        } else {
             unset($this->attributes['muted']);
         }
+
         return $this;
     }
 
@@ -108,14 +105,12 @@ class AudioMedium extends Medium
      */
     public function loop($status = false)
     {
-        if($status)
-        {
+        if($status) {
             $this->attributes['loop'] = true;
-        }
-        else
-        {
+        } else {
             unset($this->attributes['loop']);
         }
+
         return $this;
     }
 
@@ -127,14 +122,12 @@ class AudioMedium extends Medium
      */
     public function autoplay($status = false)
     {
-        if($status)
-        {
+        if($status) {
             $this->attributes['autoplay'] = true;
-        }
-        else
-        {
+        } else {
             unset($this->attributes['autoplay']);
         }
+
         return $this;
     }
 
@@ -149,6 +142,7 @@ class AudioMedium extends Medium
         parent::reset();
 
         $this->attributes['controls'] = true;
+
         return $this;
     }
 }
diff --git a/system/src/Grav/Common/Page/Medium/ImageMedium.php b/system/src/Grav/Common/Page/Medium/ImageMedium.php
index bfd0f115e..bae243102 100644
--- a/system/src/Grav/Common/Page/Medium/ImageMedium.php
+++ b/system/src/Grav/Common/Page/Medium/ImageMedium.php
@@ -267,7 +267,8 @@ class ImageMedium extends Medium
      * @param  int       [$step=200]
      * @return $this
      */
-    public function derivatives($min_width, $max_width = 2500, $step = 200) {
+    public function derivatives($min_width, $max_width = 2500, $step = 200)
+    {
         if (!empty($this->alternatives)) {
             $max = max(array_keys($this->alternatives));
             $base = $this->alternatives[$max];
@@ -347,7 +348,7 @@ class ImageMedium extends Medium
             $attributes['sizes'] = $this->sizes();
         }
 
-        return [ 'name' => 'img', 'attributes' => $attributes ];
+        return ['name' => 'img', 'attributes' => $attributes];
     }
 
     /**
@@ -483,10 +484,12 @@ class ImageMedium extends Medium
      */
     public function width($value = 'auto')
     {
-        if (!$value || $value === 'auto')
+        if (!$value || $value === 'auto') {
             $this->attributes['width'] = $this->get('width');
-        else
+        } else {
             $this->attributes['width'] = $value;
+        }
+
         return $this;
     }
 
@@ -504,10 +507,12 @@ class ImageMedium extends Medium
      */
     public function height($value = 'auto')
     {
-        if (!$value || $value === 'auto')
+        if (!$value || $value === 'auto') {
             $this->attributes['height'] = $this->get('height');
-        else
+        } else {
             $this->attributes['height'] = $value;
+        }
+
         return $this;
     }
 
diff --git a/system/src/Grav/Common/Page/Medium/Medium.php b/system/src/Grav/Common/Page/Medium/Medium.php
index 44ddaec6e..8d12b63cf 100644
--- a/system/src/Grav/Common/Page/Medium/Medium.php
+++ b/system/src/Grav/Common/Page/Medium/Medium.php
@@ -33,7 +33,7 @@ class Medium extends Data implements RenderableInterface, MediaObjectInterface
     /**
      * @var array
      */
-    protected $thumbnailTypes = [ 'page', 'default' ];
+    protected $thumbnailTypes = ['page', 'default'];
 
     protected $thumbnailType = null;
 
@@ -267,7 +267,7 @@ class Medium extends Data implements RenderableInterface, MediaObjectInterface
      */
     public function querystring($querystring = null, $withQuestionmark = true)
     {
-        if (!is_null($querystring)) {
+        if (null !== $querystring) {
             $this->medium_querystring[] = ltrim($querystring, '?&');
             foreach ($this->alternatives as $alt) {
                 $alt->querystring($querystring, $withQuestionmark);
@@ -279,11 +279,11 @@ class Medium extends Data implements RenderableInterface, MediaObjectInterface
         }
 
         // join the strings
-        $querystring = implode("&", $this->medium_querystring);
+        $querystring = implode('&', $this->medium_querystring);
         // explode all strings
-        $query_parts = explode("&", $querystring);
+        $query_parts = explode('&', $querystring);
         // Join them again now ensure the elements are unique
-        $querystring = implode("&", array_unique($query_parts));
+        $querystring = implode('&', array_unique($query_parts));
 
         return $withQuestionmark ? ('?' . $querystring) : $querystring;
     }
@@ -561,7 +561,7 @@ class Medium extends Data implements RenderableInterface, MediaObjectInterface
     {
         $classes = func_get_args();
         if (!empty($classes)) {
-            $this->attributes['class'] = implode(',', (array)$classes);
+            $this->attributes['class'] = implode(',', $classes);
         }
 
         return $this;
@@ -606,7 +606,7 @@ class Medium extends Data implements RenderableInterface, MediaObjectInterface
     public function __call($method, $args)
     {
         $qs = $method;
-        if (count($args) > 1 || (count($args) == 1 && !empty($args[0]))) {
+        if (\count($args) > 1 || (\count($args) === 1 && !empty($args[0]))) {
             $qs .= '=' . implode(',', array_map(function ($a) {
                 if (is_array($a)) {
                     $a = '[' . implode(',', $a) . ']';
diff --git a/system/src/Grav/Common/Page/Medium/MediumFactory.php b/system/src/Grav/Common/Page/Medium/MediumFactory.php
index 112efc042..7f253e24d 100644
--- a/system/src/Grav/Common/Page/Medium/MediumFactory.php
+++ b/system/src/Grav/Common/Page/Medium/MediumFactory.php
@@ -132,23 +132,17 @@ class MediumFactory
         switch ($type) {
             case 'image':
                 return new ImageMedium($items, $blueprint);
-                break;
             case 'thumbnail':
                 return new ThumbnailImageMedium($items, $blueprint);
-                break;
             case 'animated':
             case 'vector':
                 return new StaticImageMedium($items, $blueprint);
-                break;
             case 'video':
                 return new VideoMedium($items, $blueprint);
-                break;
             case 'audio':
                 return new AudioMedium($items, $blueprint);
-                break;
             default:
                 return new Medium($items, $blueprint);
-                break;
         }
     }
 
diff --git a/system/src/Grav/Common/Page/Medium/ParsedownHtmlTrait.php b/system/src/Grav/Common/Page/Medium/ParsedownHtmlTrait.php
index c66a1dd8a..627c361ff 100644
--- a/system/src/Grav/Common/Page/Medium/ParsedownHtmlTrait.php
+++ b/system/src/Grav/Common/Page/Medium/ParsedownHtmlTrait.php
@@ -16,7 +16,7 @@ trait ParsedownHtmlTrait
     /**
      * @var \Grav\Common\Markdown\Parsedown
      */
-    protected $parsedown = null;
+    protected $parsedown;
 
     /**
      * Return HTML markup from the medium.
diff --git a/system/src/Grav/Common/Page/Medium/StaticImageMedium.php b/system/src/Grav/Common/Page/Medium/StaticImageMedium.php
index 5a055ce87..b0f139137 100644
--- a/system/src/Grav/Common/Page/Medium/StaticImageMedium.php
+++ b/system/src/Grav/Common/Page/Medium/StaticImageMedium.php
@@ -24,6 +24,6 @@ class StaticImageMedium extends Medium
     {
         empty($attributes['src']) && $attributes['src'] = $this->url($reset);
 
-        return [ 'name' => 'img', 'attributes' => $attributes ];
+        return ['name' => 'img', 'attributes' => $attributes];
     }
 }
diff --git a/system/src/Grav/Common/Page/Page.php b/system/src/Grav/Common/Page/Page.php
index 54205cae9..bdd90ced6 100644
--- a/system/src/Grav/Common/Page/Page.php
+++ b/system/src/Grav/Common/Page/Page.php
@@ -9,7 +9,6 @@
 
 namespace Grav\Common\Page;
 
-use Exception;
 use Grav\Common\Cache;
 use Grav\Common\Config\Config;
 use Grav\Common\Data\Blueprint;
@@ -27,6 +26,7 @@ use Grav\Common\Yaml;
 use Negotiation\Negotiator;
 use RocketTheme\Toolbox\Event\Event;
 use RocketTheme\Toolbox\File\MarkdownFile;
+use Symfony\Component\Yaml\Exception\ParseException;
 
 define('PAGE_ORDER_PREFIX_REGEX', '/^[0-9]+\./u');
 
@@ -143,7 +143,7 @@ class Page implements PageInterface
 
         $this->hide_home_route = $config->get('system.home.hide_in_urls', false);
         $this->home_route = $this->adjustRouteCase($config->get('system.home.alias'));
-        $this->filePath($file->getPathName());
+        $this->filePath($file->getPathname());
         $this->modified($file->getMTime());
         $this->id($this->modified() . md5($this->filePath()));
         $this->routable(true);
@@ -198,7 +198,7 @@ class Page implements PageInterface
                 $aPage = new Page();
                 $aPage->init(new \SplFileInfo($path), $language . '.md');
 
-                $route = isset($aPage->header()->routes['default']) ? $aPage->header()->routes['default'] : $aPage->rawRoute();
+                $route = $aPage->header()->routes['default'] ?? $aPage->rawRoute();
                 if (!$route) {
                     $route = $aPage->route();
                 }
@@ -223,7 +223,7 @@ class Page implements PageInterface
      */
     public function untranslatedLanguages($includeUnpublished = false)
     {
-        $filename = substr($this->name, 0, -(strlen($this->extension())));
+        $filename = substr($this->name, 0, -strlen($this->extension()));
         $config = Grav::instance()['config'];
         $languages = $config->get('system.languages.supported', []);
         $untranslatedLanguages = [];
@@ -365,10 +365,10 @@ class Page implements PageInterface
 
         if ($var) {
             if (isset($this->header->slug)) {
-                $this->slug(($this->header->slug));
+                $this->slug($this->header->slug);
             }
             if (isset($this->header->routes)) {
-                $this->routes = (array)($this->header->routes);
+                $this->routes = (array)$this->header->routes;
             }
             if (isset($this->header->title)) {
                 $this->title = trim($this->header->title);
@@ -418,7 +418,7 @@ class Page implements PageInterface
                 }
             }
             if (isset($this->header->max_count)) {
-                $this->max_count = intval($this->header->max_count);
+                $this->max_count = (int)$this->header->max_count;
             }
             if (isset($this->header->process)) {
                 foreach ((array)$this->header->process as $process => $status) {
@@ -435,7 +435,7 @@ class Page implements PageInterface
                 $this->unpublishDate($this->header->unpublish_date);
             }
             if (isset($this->header->expires)) {
-                $this->expires = intval($this->header->expires);
+                $this->expires = (int)$this->header->expires;
             }
             if (isset($this->header->cache_control)) {
                 $this->cache_control = $this->header->cache_control;
@@ -612,7 +612,7 @@ class Page implements PageInterface
             return mb_strimwidth($content, 0, $size, '...', 'utf-8');
         }
 
-        $summary = Utils::truncateHTML($content, $size);
+        $summary = Utils::truncateHtml($content, $size);
 
         return html_entity_decode($summary);
     }
@@ -674,13 +674,13 @@ class Page implements PageInterface
             $process_markdown = $this->shouldProcess('markdown');
             $process_twig = $this->shouldProcess('twig') || $this->modularTwig();
 
-            $cache_enable = isset($this->header->cache_enable) ? $this->header->cache_enable : $config->get('system.cache.enabled',
+            $cache_enable = $this->header->cache_enable ?? $config->get('system.cache.enabled',
                 true);
-            $twig_first = isset($this->header->twig_first) ? $this->header->twig_first : $config->get('system.pages.twig_first',
+            $twig_first = $this->header->twig_first ?? $config->get('system.pages.twig_first',
                 true);
 
             // never cache twig means it's always run after content
-            $never_cache_twig = isset($this->header->never_cache_twig) ? $this->header->never_cache_twig : $config->get('system.pages.never_cache_twig',
+            $never_cache_twig = $this->header->never_cache_twig ?? $config->get('system.pages.never_cache_twig',
                 false);
 
             // if no cached-content run everything
@@ -877,9 +877,7 @@ class Page implements PageInterface
      */
     public function setRawContent($content)
     {
-        $content = $content === null ? '': $content;
-
-        $this->content = $content;
+        $this->content = $content ?? '';
     }
 
     /**
@@ -1037,10 +1035,10 @@ class Page implements PageInterface
         $this->_action = 'move';
 
         if ($this->route() === $parent->route()) {
-            throw new Exception('Failed: Cannot set page parent to self');
+            throw new \RuntimeException('Failed: Cannot set page parent to self');
         }
         if (Utils::startsWith($parent->rawRoute(), $this->rawRoute())) {
-            throw new Exception('Failed: Cannot set page parent to a child of current page');
+            throw new \RuntimeException('Failed: Cannot set page parent to a child of current page');
         }
 
         $this->parent($parent);
@@ -1123,7 +1121,7 @@ class Page implements PageInterface
     /**
      * Validate page header.
      *
-     * @throws Exception
+     * @throws \Exception
      */
     public function validate()
     {
@@ -1465,7 +1463,7 @@ class Page implements PageInterface
             $this->expires = $var;
         }
 
-        return !isset($this->expires) ? Grav::instance()['config']->get('system.pages.expires') : $this->expires;
+        return $this->expires ?? Grav::instance()['config']->get('system.pages.expires');
     }
 
     /**
@@ -1481,7 +1479,7 @@ class Page implements PageInterface
             $this->cache_control = $var;
         }
 
-        return !isset($this->cache_control) ? Grav::instance()['config']->get('system.pages.cache_control') : $this->cache_control;
+        return $this->cache_control ?? Grav::instance()['config']->get('system.pages.cache_control');
     }
 
     /**
@@ -1653,11 +1651,7 @@ class Page implements PageInterface
      */
     public function debugger()
     {
-        if (isset($this->debugger) && $this->debugger === false) {
-            return false;
-        }
-
-        return true;
+        return !(isset($this->debugger) && $this->debugger === false);
     }
 
     /**
@@ -1772,7 +1766,7 @@ class Page implements PageInterface
     public function order($var = null)
     {
         if ($var !== null) {
-            $order = !empty($var) ? sprintf('%02d.', (int)$var) : '';
+            $order = $var ? sprintf('%02d.', (int)$var) : '';
             $this->folder($order . preg_replace(PAGE_ORDER_PREFIX_REGEX, '', $this->folder));
 
             return $order;
@@ -1780,7 +1774,7 @@ class Page implements PageInterface
 
         preg_match(PAGE_ORDER_PREFIX_REGEX, $this->folder, $order);
 
-        return isset($order[0]) ? $order[0] : false;
+        return $order[0] ?? false;
     }
 
     /**
@@ -1914,8 +1908,7 @@ class Page implements PageInterface
      */
     public function unsetRouteSlug()
     {
-        unset($this->route);
-        unset($this->slug);
+        unset($this->route, $this->slug);
     }
 
     /**
@@ -2087,7 +2080,7 @@ class Page implements PageInterface
             // Folder of the page.
             $this->folder = basename(dirname($var));
             // Path to the page.
-            $this->path = dirname(dirname($var));
+            $this->path = dirname($var, 2);
         }
 
         return $this->path . '/' . $this->folder . '/' . ($this->name ?: '');
@@ -2100,9 +2093,7 @@ class Page implements PageInterface
      */
     public function filePathClean()
     {
-        $path = str_replace(ROOT_DIR, '', $this->filePath());
-
-        return $path;
+        return str_replace(ROOT_DIR, '', $this->filePath());
     }
 
     /**
@@ -2110,9 +2101,7 @@ class Page implements PageInterface
      */
     public function relativePagePath()
     {
-        $path = str_replace('/' . $this->name(), '', $this->filePathClean());
-
-        return $path;
+        return str_replace('/' . $this->name(), '', $this->filePathClean());
     }
 
     /**
@@ -2328,7 +2317,7 @@ class Page implements PageInterface
      */
     public function shouldProcess($process)
     {
-        return isset($this->process[$process]) ? (bool)$this->process[$process] : false;
+        return (bool)($this->process[$process] ?? false);
     }
 
     /**
@@ -2485,14 +2474,7 @@ class Page implements PageInterface
         $uri_path = rtrim(urldecode(Grav::instance()['uri']->path()), '/') ?: '/';
         $routes = Grav::instance()['pages']->routes();
 
-        if (isset($routes[$uri_path])) {
-            if ($routes[$uri_path] === $this->path()) {
-                return true;
-            }
-
-        }
-
-        return false;
+        return isset($routes[$uri_path]) && $routes[$uri_path] === $this->path();
     }
 
     /**
@@ -2532,9 +2514,8 @@ class Page implements PageInterface
     public function home()
     {
         $home = Grav::instance()['config']->get('system.home.alias');
-        $is_home = ($this->route() === $home || $this->rawRoute() === $home);
 
-        return $is_home;
+        return $this->route() === $home || $this->rawRoute() === $home;
     }
 
     /**
@@ -2544,11 +2525,7 @@ class Page implements PageInterface
      */
     public function root()
     {
-        if (!$this->parent && !$this->name && !$this->visible) {
-            return true;
-        }
-
-        return false;
+        return !$this->parent && !$this->name && !$this->visible;
     }
 
     /**
@@ -2677,7 +2654,7 @@ class Page implements PageInterface
         /** @var Config $config */
         $config = Grav::instance()['config'];
 
-        $process_taxonomy = isset($params['url_taxonomy_filters']) ? $params['url_taxonomy_filters'] : $config->get('system.pages.url_taxonomy_filters');
+        $process_taxonomy = $params['url_taxonomy_filters'] ?? $config->get('system.pages.url_taxonomy_filters');
 
         if ($process_taxonomy) {
             foreach ((array)$config->get('site.taxonomies') as $taxonomy) {
@@ -2774,17 +2751,17 @@ class Page implements PageInterface
         }
 
         if (isset($params['dateRange'])) {
-            $start = isset($params['dateRange']['start']) ? $params['dateRange']['start'] : 0;
-            $end = isset($params['dateRange']['end']) ? $params['dateRange']['end'] : false;
-            $field = isset($params['dateRange']['field']) ? $params['dateRange']['field'] : false;
+            $start = $params['dateRange']['start'] ?? 0;
+            $end = $params['dateRange']['end'] ?? false;
+            $field = $params['dateRange']['field'] ?? false;
             $collection->dateRange($start, $end, $field);
         }
 
         if (isset($params['order'])) {
-            $by = isset($params['order']['by']) ? $params['order']['by'] : 'default';
-            $dir = isset($params['order']['dir']) ? $params['order']['dir'] : 'asc';
-            $custom = isset($params['order']['custom']) ? $params['order']['custom'] : null;
-            $sort_flags = isset($params['order']['sort_flags']) ? $params['order']['sort_flags'] : null;
+            $by = $params['order']['by'] ?? 'default';
+            $dir = $params['order']['dir'] ?? 'asc';
+            $custom = $params['order']['custom'] ?? null;
+            $sort_flags = $params['order']['sort_flags'] ?? null;
 
             if (is_array($sort_flags)) {
                 $sort_flags = array_map('constant', $sort_flags); //transform strings to constant value
@@ -2806,7 +2783,7 @@ class Page implements PageInterface
         if ($pagination) {
             $params = $collection->params();
 
-            $limit = isset($params['limit']) ? $params['limit'] : 0;
+            $limit = $params['limit'] ?? 0;
             $start = !empty($params['pagination']) ? ($uri->currentPage() - 1) * $limit : 0;
 
             if ($limit && $collection->count() > $limit) {
@@ -3132,11 +3109,7 @@ class Page implements PageInterface
     {
         $case_insensitive = Grav::instance()['config']->get('system.force_lowercase_urls');
 
-        if ($case_insensitive) {
-            return mb_strtolower($route);
-        } else {
-            return $route;
-        }
+        return $case_insensitive ? mb_strtolower($route) : $route;
     }
 
     /**
diff --git a/system/src/Grav/Common/Page/Pages.php b/system/src/Grav/Common/Page/Pages.php
index 1d99c176b..754062f80 100644
--- a/system/src/Grav/Common/Page/Pages.php
+++ b/system/src/Grav/Common/Page/Pages.php
@@ -181,7 +181,13 @@ class Pages
      */
     public function baseUrl($lang = null, $absolute = null)
     {
-        $type = $absolute === null ? 'base_url' : ($absolute ? 'base_url_absolute' : 'base_url_relative');
+        if ($absolute === null) {
+            $type = 'base_url';
+        } elseif ($absolute) {
+            $type = 'base_url_absolute';
+        } else {
+            $type = 'base_url_relative';
+        }
 
         return $this->grav[$type] . $this->baseRoute($lang);
     }
@@ -311,7 +317,7 @@ class Pages
         }
 
         $path = $page->path();
-        $children = isset($this->children[$path]) ? $this->children[$path] : [];
+        $children = $this->children[$path] ?? [];
 
         if (!$children) {
             return $children;
@@ -372,7 +378,7 @@ class Pages
      */
     public function get($path)
     {
-        return isset($this->instances[(string)$path]) ? $this->instances[(string)$path] : null;
+        return $this->instances[(string)$path] ?? null;
     }
 
     /**
@@ -384,7 +390,7 @@ class Pages
      */
     public function children($path)
     {
-        $children = isset($this->children[(string)$path]) ? $this->children[(string)$path] : [];
+        $children = $this->children[(string)$path] ?? [];
 
         return new Collection($children, [], $this);
     }
@@ -500,7 +506,7 @@ class Pages
                     $source_url = $uri->uri(false);
 
                     // Try Regex style redirects
-                    $site_redirects = $config->get("site.redirects");
+                    $site_redirects = $config->get('site.redirects');
                     if (is_array($site_redirects)) {
                         foreach ((array)$site_redirects as $pattern => $replace) {
                             $pattern = '#^' . str_replace('/', '\/', ltrim($pattern, '^')) . '#';
@@ -516,7 +522,7 @@ class Pages
                     }
 
                     // Try Regex style routes
-                    $site_routes = $config->get("site.routes");
+                    $site_routes = $config->get('site.routes');
                     if (is_array($site_routes)) {
                         foreach ((array)$site_routes as $pattern => $replace) {
                             $pattern = '#^' . str_replace('/', '\/', ltrim($pattern, '^')) . '#';
@@ -825,19 +831,18 @@ class Pages
         $accessLevels = [];
         foreach ($this->all() as $page) {
             if (isset($page->header()->access)) {
-                if (is_array($page->header()->access)) {
+                if (\is_array($page->header()->access)) {
                     foreach ($page->header()->access as $index => $accessLevel) {
-                        if (is_array($accessLevel)) {
+                        if (\is_array($accessLevel)) {
                             foreach ($accessLevel as $innerIndex => $innerAccessLevel) {
-                                array_push($accessLevels, $innerIndex);
+                                $accessLevels[] = $innerIndex;
                             }
                         } else {
-                            array_push($accessLevels, $index);
+                            $accessLevels[] = $index;
                         }
                     }
                 } else {
-
-                    array_push($accessLevels, $page->header()->access);
+                    $accessLevels[] = $page->header()->access;
                 }
             }
         }
@@ -1016,13 +1021,10 @@ class Pages
         /** @var Language $language */
         $language = $this->grav['language'];
 
-        // stuff to do at root page
-        if ($parent === null) {
-
-            // Fire event for memory and time consuming plugins...
-            if ($config->get('system.pages.events.page')) {
-                $this->grav->fireEvent('onBuildPagesInitialized');
-            }
+        // Stuff to do at root page
+        // Fire event for memory and time consuming plugins...
+        if ($parent === null && $config->get('system.pages.events.page')) {
+            $this->grav->fireEvent('onBuildPagesInitialized');
         }
 
         $page->path($directory);
@@ -1063,7 +1065,7 @@ class Pages
             $filename = $file->getFilename();
 
             // Ignore all hidden files if set.
-            if ($this->ignore_hidden && $filename && $filename[0] === '.') {
+            if ($this->ignore_hidden && $filename && strpos($filename, '.') === 0) {
                 continue;
             }
 
@@ -1216,9 +1218,10 @@ class Pages
         }
 
         // Alias and set default route to home page.
-        if ($home && isset($this->routes['/' . $home])) {
-            $this->routes['/'] = $this->routes['/' . $home];
-            $this->get($this->routes['/' . $home])->route('/');
+        $homeRoute = '/' . $home;
+        if ($home && isset($this->routes[$homeRoute])) {
+            $this->routes['/'] = $this->routes[$homeRoute];
+            $this->get($this->routes[$homeRoute])->route('/');
         }
     }
 
@@ -1247,7 +1250,7 @@ class Pages
         }
 
         foreach ($pages as $key => $info) {
-            $child = isset($this->instances[$key]) ? $this->instances[$key] : null;
+            $child = $this->instances[$key] ?? null;
             if (!$child) {
                 throw new \RuntimeException("Page does not exist: {$key}");
             }
diff --git a/system/src/Grav/Common/Page/Types.php b/system/src/Grav/Common/Page/Types.php
index 94d7f6e9c..03e3f6eb0 100644
--- a/system/src/Grav/Common/Page/Types.php
+++ b/system/src/Grav/Common/Page/Types.php
@@ -136,8 +136,6 @@ class Types implements \ArrayAccess, \Iterator, \Countable
             $options['value'] = 'Url';
         }
 
-        $list = Folder::all($uri, $options);
-
-        return $list;
+        return Folder::all($uri, $options);
     }
 }
diff --git a/system/src/Grav/Common/Plugin.php b/system/src/Grav/Common/Plugin.php
index e28098eda..6048217c5 100644
--- a/system/src/Grav/Common/Plugin.php
+++ b/system/src/Grav/Common/Plugin.php
@@ -15,7 +15,6 @@ use Grav\Common\Config\Config;
 use RocketTheme\Toolbox\Event\EventDispatcher;
 use RocketTheme\Toolbox\Event\EventSubscriberInterface;
 use RocketTheme\Toolbox\File\YamlFile;
-use Symfony\Component\Console\Exception\LogicException;
 
 class Plugin implements EventSubscriberInterface, \ArrayAccess
 {
@@ -218,22 +217,22 @@ class Plugin implements EventSubscriberInterface, \ArrayAccess
      *
      * @param mixed $offset  The offset to assign the value to.
      * @param mixed $value   The value to set.
-     * @throws LogicException
+     * @throws \LogicException
      */
     public function offsetSet($offset, $value)
     {
-        throw new LogicException(__CLASS__ . ' blueprints cannot be modified.');
+        throw new \LogicException(__CLASS__ . ' blueprints cannot be modified.');
     }
 
     /**
      * Unsets an offset.
      *
      * @param mixed $offset  The offset to unset.
-     * @throws LogicException
+     * @throws \LogicException
      */
     public function offsetUnset($offset)
     {
-        throw new LogicException(__CLASS__ . ' blueprints cannot be modified.');
+        throw new \LogicException(__CLASS__ . ' blueprints cannot be modified.');
     }
 
     /**
diff --git a/system/src/Grav/Common/Plugins.php b/system/src/Grav/Common/Plugins.php
index 7e02f4778..6c0b89bf1 100644
--- a/system/src/Grav/Common/Plugins.php
+++ b/system/src/Grav/Common/Plugins.php
@@ -168,7 +168,7 @@ class Plugins extends Iterator
             return null;
         }
 
-        $obj = new Data($file->content(), $blueprint);
+        $obj = new Data((array)$file->content(), $blueprint);
 
         // Override with user configuration.
         $obj->merge(Grav::instance()['config']->get('plugins.' . $name) ?: []);
diff --git a/system/src/Grav/Common/Scheduler/Cron.php b/system/src/Grav/Common/Scheduler/Cron.php
index f3507e313..c74d5fca8 100644
--- a/system/src/Grav/Common/Scheduler/Cron.php
+++ b/system/src/Grav/Common/Scheduler/Cron.php
@@ -45,20 +45,21 @@ namespace Grav\Common\Scheduler;
  * var_dump($cron->matchWithMargin(new \DateTime('2012-07-01 12:32:50'), -3, 5));
  * //  bool(true)
  */
-class Cron {
-    const TYPE_UNDEFINED = '';
-    const TYPE_MINUTE = 'minute';
-    const TYPE_HOUR = 'hour';
-    const TYPE_DAY = 'day';
-    const TYPE_WEEK = 'week';
-    const TYPE_MONTH = 'month';
-    const TYPE_YEAR = 'year';
+class Cron
+{
+    public const TYPE_UNDEFINED = '';
+    public const TYPE_MINUTE = 'minute';
+    public const TYPE_HOUR = 'hour';
+    public const TYPE_DAY = 'day';
+    public const TYPE_WEEK = 'week';
+    public const TYPE_MONTH = 'month';
+    public const TYPE_YEAR = 'year';
     /**
      *
      * @var array
      */
-    protected $texts = array(
-        'fr' => array(
+    protected $texts = [
+        'fr' => [
             'empty' => '-tout-',
             'name_minute' => 'minute',
             'name_hour' => 'heure',
@@ -72,10 +73,10 @@ class Cron {
             'text_dow' => 'le %s',
             'text_month' => 'de %s',
             'text_dom' => 'le %s',
-            'weekdays' => array('lundi', 'mardi', 'mercredi', 'jeudi', 'vendredi', 'samedi', 'dimanche'),
-            'months' => array('janvier', 'février', 'mars', 'avril', 'mai', 'juin', 'juillet', 'août', 'septembre', 'octobre', 'novembre', 'décembre'),
-        ),
-        'en' => array(
+            'weekdays' => ['lundi', 'mardi', 'mercredi', 'jeudi', 'vendredi', 'samedi', 'dimanche'],
+            'months' => ['janvier', 'février', 'mars', 'avril', 'mai', 'juin', 'juillet', 'août', 'septembre', 'octobre', 'novembre', 'décembre'],
+        ],
+        'en' => [
             'empty' => '-all-',
             'name_minute' => 'minute',
             'name_hour' => 'hour',
@@ -89,10 +90,11 @@ class Cron {
             'text_dow' => 'on %s',
             'text_month' => 'of %s',
             'text_dom' => 'on the %s',
-            'weekdays' => array('monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday', 'sunday'),
-            'months' => array('january', 'february', 'march', 'april', 'may', 'june', 'july', 'august', 'september', 'october', 'november', 'december'),
-        ),
-    );
+            'weekdays' => ['monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday', 'sunday'],
+            'months' => ['january', 'february', 'march', 'april', 'may', 'june', 'july', 'august', 'september', 'october', 'november', 'december'],
+        ],
+    ];
+
     /**
      * min hour dom month dow
      * @var string
@@ -102,48 +104,52 @@ class Cron {
      *
      * @var array
      */
-    protected $minutes = array();
+    protected $minutes = [];
     /**
      *
      * @var array
      */
-    protected $hours = array();
+    protected $hours = [];
     /**
      *
      * @var array
      */
-    protected $months = array();
+    protected $months = [];
     /**
      * 0-7 : sunday, monday, ... saturday, sunday
      * @var array
      */
-    protected $dow = array();
+    protected $dow = [];
     /**
      *
      * @var array
      */
-    protected $dom = array();
+    protected $dom = [];
+
     /**
      *
      * @param string $cron
      */
-    public function __construct($cron = null) {
-        if (!empty($cron)) {
+    public function __construct($cron = null)
+    {
+        if (null !== $cron) {
             $this->setCron($cron);
         }
     }
+
     /**
      *
      * @return string
      */
-    public function getCron() {
-        return implode(' ', array(
+    public function getCron()
+    {
+        return implode(' ', [
             $this->getCronMinutes(),
             $this->getCronHours(),
             $this->getCronDaysOfMonth(),
             $this->getCronMonths(),
             $this->getCronDaysOfWeek(),
-        ));
+        ]);
     }
 
     /**
@@ -151,20 +157,23 @@ class Cron {
      * @param string $lang 'fr' or 'en'
      * @return string
      */
-    public function getText($lang) {
+    public function getText($lang)
+    {
         // check lang
         if (!isset($this->texts[$lang])) {
             return $this->getCron();
         }
+
         $texts = $this->texts[$lang];
         // check type
+
         $type = $this->getType();
         if ($type == self::TYPE_UNDEFINED) {
             return $this->getCron();
         }
 
         // init
-        $elements = array();
+        $elements = [];
         $elements[] = sprintf($texts['text_period'], $texts['name_' . $type]);
 
         // hour
@@ -207,26 +216,33 @@ class Cron {
      *
      * @return string
      */
-    public function getType() {
-        $mask = preg_replace('/[^\* ]/si', '-', $this->getCron());
-        $mask = preg_replace('/-+/si', '-', $mask);
-        $mask = preg_replace('/[^-\*]/si', '', $mask);
-        if ($mask == '*****') {
+    public function getType()
+    {
+        $mask = preg_replace('/[^\* ]/', '-', $this->getCron());
+        $mask = preg_replace('/-+/', '-', $mask);
+        $mask = preg_replace('/[^-\*]/', '', $mask);
+
+        if ($mask === '*****') {
             return self::TYPE_MINUTE;
         }
-        elseif ($mask == '-****') {
+
+        if ($mask === '-****') {
             return self::TYPE_HOUR;
         }
-        elseif (substr($mask, -3) == '***') {
+
+        if (substr($mask, -3) === '***') {
             return self::TYPE_DAY;
         }
-        elseif (substr($mask, -3) == '-**') {
+
+        if (substr($mask, -3) === '-**') {
             return self::TYPE_MONTH;
         }
-        elseif (substr($mask, -3) == '**-') {
+
+        if (substr($mask, -3) === '**-') {
             return self::TYPE_WEEK;
         }
-        elseif (substr($mask, -2) == '-*') {
+
+        if (substr($mask, -2) === '-*') {
             return self::TYPE_YEAR;
         }
 
@@ -238,14 +254,15 @@ class Cron {
      * @param string $cron
      * @return Cron
      */
-    public function setCron($cron) {
+    public function setCron($cron)
+    {
         // sanitize
         $cron = trim($cron);
         $cron = preg_replace('/\s+/', ' ', $cron);
         // explode
         $elements = explode(' ', $cron);
-        if (count($elements) != 5) {
-            throw new Exception('Bad number of elements');
+        if (\count($elements) !== 5) {
+            throw new \RuntimeException('Bad number of elements');
         }
 
         $this->cron = $cron;
@@ -262,7 +279,8 @@ class Cron {
      *
      * @return string
      */
-    public function getCronMinutes() {
+    public function getCronMinutes()
+    {
         return $this->arrayToCron($this->minutes);
     }
 
@@ -270,7 +288,8 @@ class Cron {
      *
      * @return string
      */
-    public function getCronHours() {
+    public function getCronHours()
+    {
         return $this->arrayToCron($this->hours);
     }
 
@@ -278,7 +297,8 @@ class Cron {
      *
      * @return string
      */
-    public function getCronDaysOfMonth() {
+    public function getCronDaysOfMonth()
+    {
         return $this->arrayToCron($this->dom);
     }
 
@@ -286,7 +306,8 @@ class Cron {
      *
      * @return string
      */
-    public function getCronMonths() {
+    public function getCronMonths()
+    {
         return $this->arrayToCron($this->months);
     }
 
@@ -294,7 +315,8 @@ class Cron {
      *
      * @return string
      */
-    public function getCronDaysOfWeek() {
+    public function getCronDaysOfWeek()
+    {
         return $this->arrayToCron($this->dow);
     }
 
@@ -302,7 +324,8 @@ class Cron {
      *
      * @return array
      */
-    public function getMinutes() {
+    public function getMinutes()
+    {
         return $this->minutes;
     }
 
@@ -310,7 +333,8 @@ class Cron {
      *
      * @return array
      */
-    public function getHours() {
+    public function getHours()
+    {
         return $this->hours;
     }
 
@@ -318,7 +342,8 @@ class Cron {
      *
      * @return array
      */
-    public function getDaysOfMonth() {
+    public function getDaysOfMonth()
+    {
         return $this->dom;
     }
 
@@ -326,7 +351,8 @@ class Cron {
      *
      * @return array
      */
-    public function getMonths() {
+    public function getMonths()
+    {
         return $this->months;
     }
 
@@ -334,7 +360,8 @@ class Cron {
      *
      * @return array
      */
-    public function getDaysOfWeek() {
+    public function getDaysOfWeek()
+    {
         return $this->dow;
     }
 
@@ -343,7 +370,8 @@ class Cron {
      * @param string|array $minutes
      * @return Cron
      */
-    public function setMinutes($minutes) {
+    public function setMinutes($minutes)
+    {
         $this->minutes = $this->cronToArray($minutes, 0, 59);
 
         return $this;
@@ -354,7 +382,8 @@ class Cron {
      * @param string|array $hours
      * @return Cron
      */
-    public function setHours($hours) {
+    public function setHours($hours)
+    {
         $this->hours = $this->cronToArray($hours, 0, 23);
 
         return $this;
@@ -365,7 +394,8 @@ class Cron {
      * @param string|array $months
      * @return Cron
      */
-    public function setMonths($months) {
+    public function setMonths($months)
+    {
         $this->months = $this->cronToArray($months, 1, 12);
 
         return $this;
@@ -376,7 +406,8 @@ class Cron {
      * @param string|array $dow
      * @return Cron
      */
-    public function setDaysOfWeek($dow) {
+    public function setDaysOfWeek($dow)
+    {
         $this->dow = $this->cronToArray($dow, 0, 7);
 
         return $this;
@@ -387,7 +418,8 @@ class Cron {
      * @param string|array $dom
      * @return Cron
      */
-    public function setDaysOfMonth($dom) {
+    public function setDaysOfMonth($dom)
+    {
         $this->dom = $this->cronToArray($dom, 1, 31);
 
         return $this;
@@ -403,22 +435,23 @@ class Cron {
      * @param int $weekday
      * @return \DateTime
      */
-    protected function parseDate($date, &$min, &$hour, &$day, &$month, &$weekday) {
-        if (is_numeric($date) && intval($date) == $date) {
+    protected function parseDate($date, &$min, &$hour, &$day, &$month, &$weekday)
+    {
+        if (is_numeric($date) && (int)$date == $date) {
             $date = new \DateTime('@' . $date);
         }
         elseif (is_string($date)) {
             $date = new \DateTime('@' . strtotime($date));
         }
         if ($date instanceof \DateTime) {
-            $min = intval($date->format('i'));
-            $hour = intval($date->format('H'));
-            $day = intval($date->format('d'));
-            $month = intval($date->format('m'));
-            $weekday = intval($date->format('w')); // 0-6
+            $min = (int)$date->format('i');
+            $hour = (int)$date->format('H');
+            $day = (int)$date->format('d');
+            $month = (int)$date->format('m');
+            $weekday = (int)$date->format('w'); // 0-6
         }
         else {
-            throw new Exception('Date format not supported');
+            throw new \RuntimeException('Date format not supported');
         }
 
         return new \DateTime($date->format('Y-m-d H:i:sP'));
@@ -428,7 +461,8 @@ class Cron {
      *
      * @param int|string|\Datetime $date
      */
-    public function matchExact($date) {
+    public function matchExact($date)
+    {
         $date = $this->parseDate($date, $min, $hour, $day, $month, $weekday);
 
         return
@@ -446,12 +480,13 @@ class Cron {
      * @param int $minuteBefore
      * @param int $minuteAfter
      */
-    public function matchWithMargin($date, $minuteBefore = 0, $minuteAfter = 0) {
+    public function matchWithMargin($date, $minuteBefore = 0, $minuteAfter = 0)
+    {
         if ($minuteBefore > 0) {
-            throw new Exception('MinuteBefore parameter cannot be positive !');
+            throw new \RuntimeException('MinuteBefore parameter cannot be positive !');
         }
         if ($minuteAfter < 0) {
-            throw new Exception('MinuteAfter parameter cannot be negative !');
+            throw new \RuntimeException('MinuteAfter parameter cannot be negative !');
         }
 
         $date = $this->parseDate($date, $min, $hour, $day, $month, $weekday);
@@ -475,17 +510,19 @@ class Cron {
      * @param array $array
      * @return string
      */
-    protected function arrayToCron($array) {
-        $n = count($array);
-        if (!is_array($array) || $n == 0) {
+    protected function arrayToCron($array)
+    {
+        $n = \count($array);
+        if (!\is_array($array) || $n === 0) {
             return '*';
         }
-        $cron = array($array[0]);
+
+        $cron = [$array[0]];
         $s = $c = $array[0];
         for ($i = 1; $i < $n; $i++) {
             if ($array[$i] == $c + 1) {
                 $c = $array[$i];
-                $cron[count($cron) - 1] = $s . '-' . $c;
+                $cron[\count($cron) - 1] = $s . '-' . $c;
             }
             else {
                 $s = $c = $array[$i];
@@ -503,29 +540,29 @@ class Cron {
      * @param int $max
      * @return array
      */
-    protected function cronToArray($string, $min, $max) {
-        $array = array();
-        if (is_array($string)) {
+    protected function cronToArray($string, $min, $max)
+    {
+        $array = [];
+        if (\is_array($string)) {
             foreach ($string as $val) {
-                if (is_numeric($val) && intval($val) == $val && $val >= $min && $val <= $max) {
-                    $array[] = intval($val);
+                if (is_numeric($val) && (int)$val == $val && $val >= $min && $val <= $max) {
+                    $array[] = (int)$val;
                 }
             }
-        }
-        else if ($string !== '*') {
-            while ($string != '') {
+        } elseif ($string !== '*') {
+            while ($string !== '') {
                 // test "*/n" expression
                 if (preg_match('/^\*\/([0-9]+),?/', $string, $m)) {
-                    for ($i = max(0, $min); $i <= min(59, $max); $i+=$m[1]) {
-                        $array[] = intval($i);
+                    for ($i = max(0, $min); $i <= min(59, $max); $i += $m[1]) {
+                        $array[] = (int)$i;
                     }
                     $string = substr($string, strlen($m[0]));
                     continue;
                 }
                 // test "a-b/n" expression
                 if (preg_match('/^([0-9]+)-([0-9]+)\/([0-9]+),?/', $string, $m)) {
-                    for ($i = max($m[1], $min); $i <= min($m[2], $max); $i+=$m[3]) {
-                        $array[] = intval($i);
+                    for ($i = max($m[1], $min); $i <= min($m[2], $max); $i += $m[3]) {
+                        $array[] = (int)$i;
                     }
                     $string = substr($string, strlen($m[0]));
                     continue;
@@ -533,7 +570,7 @@ class Cron {
                 // test "a-b" expression
                 if (preg_match('/^([0-9]+)-([0-9]+),?/', $string, $m)) {
                     for ($i = max($m[1], $min); $i <= min($m[2], $max); $i++) {
-                        $array[] = intval($i);
+                        $array[] = (int)$i;
                     }
                     $string = substr($string, strlen($m[0]));
                     continue;
@@ -541,14 +578,14 @@ class Cron {
                 // test "c" expression
                 if (preg_match('/^([0-9]+),?/', $string, $m)) {
                     if ($m[1] >= $min && $m[1] <= $max) {
-                        $array[] = intval($m[1]);
+                        $array[] = (int)$m[1];
                     }
                     $string = substr($string, strlen($m[0]));
                     continue;
                 }
 
                 // something goes wrong in the expression
-                return array();
+                return [];
             }
         }
         sort($array);
diff --git a/system/src/Grav/Common/Scheduler/IntervalTrait.php b/system/src/Grav/Common/Scheduler/IntervalTrait.php
index 8ce47578e..11d29773a 100644
--- a/system/src/Grav/Common/Scheduler/IntervalTrait.php
+++ b/system/src/Grav/Common/Scheduler/IntervalTrait.php
@@ -59,10 +59,10 @@ trait IntervalTrait
      */
     public function daily($hour = 0, $minute = 0)
     {
-        if (is_string($hour)) {
+        if (\is_string($hour)) {
             $parts = explode(':', $hour);
             $hour = $parts[0];
-            $minute = isset($parts[1]) ? $parts[1] : '0';
+            $minute = $parts[1] ?? '0';
         }
         $c = $this->validateCronSequence($minute, $hour);
 
@@ -79,10 +79,10 @@ trait IntervalTrait
      */
     public function weekly($weekday = 0, $hour = 0, $minute = 0)
     {
-        if (is_string($hour)) {
+        if (\is_string($hour)) {
             $parts = explode(':', $hour);
             $hour = $parts[0];
-            $minute = isset($parts[1]) ? $parts[1] : '0';
+            $minute = $parts[1] ?? '0';
         }
         $c = $this->validateCronSequence($minute, $hour, null, null, $weekday);
 
@@ -100,10 +100,10 @@ trait IntervalTrait
      */
     public function monthly($month = '*', $day = 1, $hour = 0, $minute = 0)
     {
-        if (is_string($hour)) {
+        if (\is_string($hour)) {
             $parts = explode(':', $hour);
             $hour = $parts[0];
-            $minute = isset($parts[1]) ? $parts[1] : '0';
+            $minute = $parts[1] ?? '0';
         }
         $c = $this->validateCronSequence($minute, $hour, $day, $month);
 
diff --git a/system/src/Grav/Common/Scheduler/Job.php b/system/src/Grav/Common/Scheduler/Job.php
index b78373020..542c0e5b5 100644
--- a/system/src/Grav/Common/Scheduler/Job.php
+++ b/system/src/Grav/Common/Scheduler/Job.php
@@ -66,7 +66,7 @@ class Job
         $this->args = $args;
         // Set enabled state
         $status = Grav::instance()['config']->get('scheduler.status');
-        $this->enabled = isset($status[$id]) && $status[$id] === 'disabled' ? false : true;
+        $this->enabled = !(isset($status[$id]) && $status[$id] === 'disabled');
     }
 
     /**
@@ -106,10 +106,11 @@ class Job
      */
     public function getArguments()
     {
-        if (is_string($this->args)) {
+        if (\is_string($this->args)) {
             return $this->args;
         }
-        return;
+
+        return null;
     }
 
     public function getCronExpression()
@@ -152,7 +153,9 @@ class Job
         if (!$this->executionTime) {
             $this->at('* * * * *');
         }
-        $date = $date !== null ? $date : $this->creationTime;
+
+        $date = $date ?? $this->creationTime;
+
         return $this->executionTime->isDue($date);
     }
 
@@ -187,10 +190,7 @@ class Job
      */
     public function runInBackground()
     {
-        if (is_callable($this->command) || $this->runInBackground === false) {
-            return false;
-        }
-        return true;
+        return !(is_callable($this->command) || $this->runInBackground === false);
     }
 
     /**
@@ -282,7 +282,7 @@ class Job
             $this->output = $this->exec();
         } else {
             /** @var Process process */
-            $args = is_string($this->args) ? $this->args : implode(' ', $this->args);
+            $args = \is_string($this->args) ? $this->args : implode(' ', $this->args);
             $command = $this->command . ' ' . $args;
             $process = new Process($command);
 
@@ -358,7 +358,7 @@ class Job
     private function createLockFile($content = null)
     {
         if ($this->lockFile) {
-            if ($content === null || !is_string($content)) {
+            if ($content === null || !\is_string($content)) {
                 $content = $this->getId();
             }
             file_put_contents($this->lockFile, $content);
@@ -380,7 +380,7 @@ class Job
     /**
      * Execute a callable job.
      *
-     * @throws Exception
+     * @throws \RuntimeException
      * @return string
      */
     private function exec()
@@ -390,7 +390,7 @@ class Job
         try {
             $return_data = call_user_func_array($this->command, $this->args);
             $this->successful = true;
-        } catch (Exception $e) {
+        } catch (\RuntimeException $e) {
             $this->successful = false;
         }
         $this->output = ob_get_clean() . (is_string($return_data) ? $return_data : '');
diff --git a/system/src/Grav/Common/Scheduler/Scheduler.php b/system/src/Grav/Common/Scheduler/Scheduler.php
index 134c7ca13..332947289 100644
--- a/system/src/Grav/Common/Scheduler/Scheduler.php
+++ b/system/src/Grav/Common/Scheduler/Scheduler.php
@@ -56,7 +56,7 @@ class Scheduler
         $saved_jobs = (array) Grav::instance()['config']->get('scheduler.custom_jobs', []);
 
         foreach ($saved_jobs as $id => $j) {
-            $args = isset($j['args']) ? $j['args'] : [];
+            $args = $j['args'] ?? [];
             $id = Grav::instance()['inflector']->hyphenize($id);
             $job = $this->addCommand($j['command'], $args, $id);
 
@@ -161,7 +161,7 @@ class Scheduler
         list($background, $foreground) = $this->getQueuedJobs(false);
         $alljobs = array_merge($background, $foreground);
 
-        if (is_null($runTime)) {
+        if (null === $runTime) {
             $runTime = new \DateTime('now');
         }
 
@@ -254,19 +254,12 @@ class Scheduler
         if ($process->isSuccessful()) {
             $output = $process->getOutput();
 
-            if (preg_match('$bin\/grav schedule$', $output)) {
-                return 1;
-            } else {
-                return 0;
-            }
-        } else {
-            $error = $process->getErrorOutput();
-            if (Utils::startsWith($error, 'crontab: no crontab')) {
-                return 0;
-            } else {
-                return 2;
-            }
+            return preg_match('$bin\/grav schedule$', $output) ? 1 : 0;
         }
+
+        $error = $process->getErrorOutput();
+
+        return Utils::startsWith($error, 'crontab: no crontab') ? 0 : 2;
     }
 
     /**
@@ -276,8 +269,7 @@ class Scheduler
      */
     public function getJobStates()
     {
-        $file = YamlFile::instance($this->status_path . '/status.yaml');
-        return $file;
+        return YamlFile::instance($this->status_path . '/status.yaml');
     }
 
     /**
@@ -342,7 +334,7 @@ class Scheduler
         $args = $job->getArguments();
         // If callable, log the string Closure
         if (is_callable($command)) {
-            $command = is_string($command) ? $command : 'Closure';
+            $command = \is_string($command) ? $command : 'Closure';
         }
         $this->addSchedulerVerboseOutput("<green>Success</green>: <white>{$command} {$args}</white>");
 
@@ -361,7 +353,7 @@ class Scheduler
         $command = $job->getCommand();
         // If callable, log the string Closure
         if (is_callable($command)) {
-            $command = is_string($command) ? $command : 'Closure';
+            $command = \is_string($command) ? $command : 'Closure';
         }
         $output = trim($job->getOutput());
         $this->addSchedulerVerboseOutput("<red>Error</red>:   <white>{$command}</white> → <normal>{$output}</normal>");
diff --git a/system/src/Grav/Common/Taxonomy.php b/system/src/Grav/Common/Taxonomy.php
index 5c9abae9a..4d7bec073 100644
--- a/system/src/Grav/Common/Taxonomy.php
+++ b/system/src/Grav/Common/Taxonomy.php
@@ -59,7 +59,7 @@ class Taxonomy
             $page_taxonomy = $page->taxonomy();
         }
 
-        if (!$page->published() || empty($page_taxonomy)) {
+        if (empty($page_taxonomy) || !$page->published()) {
             return;
         }
 
@@ -100,7 +100,7 @@ class Taxonomy
             }
         }
 
-        if (strtolower($operator) == 'or') {
+        if (strtolower($operator) === 'or') {
             foreach ($matches as $match) {
                 $results = array_merge($results, $match);
             }
@@ -137,14 +137,8 @@ class Taxonomy
      *
      * @return array                  keys of this taxonomy
      */
-    public function getTaxonomyItemKeys($taxonomy) {
-        if (isset($this->taxonomy_map[$taxonomy])) {
-
-            $results = array_keys($this->taxonomy_map[$taxonomy]);
-
-            return $results;
-        }
-
-        return [];
+    public function getTaxonomyItemKeys($taxonomy)
+    {
+        return isset($this->taxonomy_map[$taxonomy]) ? array_keys($this->taxonomy_map[$taxonomy]) : [];
     }
 }
diff --git a/system/src/Grav/Common/Theme.php b/system/src/Grav/Common/Theme.php
index b36c744bd..7b075e074 100644
--- a/system/src/Grav/Common/Theme.php
+++ b/system/src/Grav/Common/Theme.php
@@ -64,7 +64,8 @@ class Theme extends Plugin
     /**
      * Override the mergeConfig method to work for themes
      */
-    protected function mergeConfig(Page $page, $deep = 'merge', $params = [], $type = 'themes') {
+    protected function mergeConfig(Page $page, $deep = 'merge', $params = [], $type = 'themes')
+    {
         return parent::mergeConfig($page, $deep, $params, $type);
     }
 
diff --git a/system/src/Grav/Common/Themes.php b/system/src/Grav/Common/Themes.php
index 5e5f602c1..ee4f4cca7 100644
--- a/system/src/Grav/Common/Themes.php
+++ b/system/src/Grav/Common/Themes.php
@@ -144,7 +144,7 @@ class Themes extends Iterator
             $blueprint->set('thumbnail', $this->grav['base_url'] . '/' . $path);
         }
 
-        $obj = new Data($file->content(), $blueprint);
+        $obj = new Data((array)$file->content(), $blueprint);
 
         // Override with user configuration.
         $obj->merge($this->config->get('themes.' . $name) ?: []);
@@ -250,7 +250,7 @@ class Themes extends Iterator
                 }
             }
 
-            if (in_array($scheme, $registered)) {
+            if (\in_array($scheme, $registered, true)) {
                 stream_wrapper_unregister($scheme);
             }
             $type = !empty($config['type']) ? $config['type'] : 'ReadOnlyStream';
@@ -290,12 +290,12 @@ class Themes extends Iterator
         $locator = $this->grav['locator'];
 
         if ($config->get('system.languages.translations', true)) {
-            $language_file = $locator->findResource("theme://languages" . YAML_EXT);
+            $language_file = $locator->findResource('theme://languages' . YAML_EXT);
             if ($language_file) {
                 $language = CompiledYamlFile::instance($language_file)->content();
                 $this->grav['languages']->mergeRecursive($language);
             }
-            $languages_folder = $locator->findResource("theme://languages/");
+            $languages_folder = $locator->findResource('theme://languages');
             if (file_exists($languages_folder)) {
                 $languages = [];
                 $iterator = new \DirectoryIterator($languages_folder);
diff --git a/system/src/Grav/Common/Twig/Twig.php b/system/src/Grav/Common/Twig/Twig.php
index 39a63e315..d08792007 100644
--- a/system/src/Grav/Common/Twig/Twig.php
+++ b/system/src/Grav/Common/Twig/Twig.php
@@ -76,7 +76,7 @@ class Twig
      */
     public function init()
     {
-        if (!isset($this->twig)) {
+        if (null === $this->twig) {
             /** @var Config $config */
             $config = $this->grav['config'];
             /** @var UniformResourceLocator $locator */
@@ -256,7 +256,7 @@ class Twig
      */
     public function processPage(Page $item, $content = null)
     {
-        $content = $content !== null ? $content : $item->content();
+        $content = $content ?? $item->content();
 
         // override the twig header vars for local resolution
         $this->grav->fireEvent('onTwigPageVariables', new Event(['page' => $item]));
@@ -266,7 +266,7 @@ class Twig
         $twig_vars['media'] = $item->media();
         $twig_vars['header'] = $item->header();
 
-        $local_twig = clone($this->twig);
+        $local_twig = clone $this->twig;
 
         try {
             // Process Modular Twig
@@ -370,7 +370,7 @@ class Twig
         $twig_vars['header'] = $page->header();
         $twig_vars['media'] = $page->media();
         $twig_vars['content'] = $content;
-        $ext = '.' . ($format ? $format : 'html') . TWIG_EXT;
+        $ext = '.' . ($format ?: 'html') . TWIG_EXT;
 
         // determine if params are set, if so disable twig cache
         $params = $this->grav['uri']->params(null, true);
@@ -386,7 +386,7 @@ class Twig
         } catch (\Twig_Error_Loader $e) {
             $error_msg = $e->getMessage();
             // Try html version of this template if initial template was NOT html
-            if ($ext != '.html' . TWIG_EXT) {
+            if ($ext !== '.html' . TWIG_EXT) {
                 try {
                     $page->templateFormat('html');
                     $output = $this->twig->render($page->template() . '.html' . TWIG_EXT, $vars + $twig_vars);
@@ -431,11 +431,7 @@ class Twig
      */
     public function template($template)
     {
-        if (isset($this->template)) {
-            return $this->template;
-        } else {
-            return $template;
-        }
+        return $this->template ?? $template;
     }
 
     /**
diff --git a/system/src/Grav/Common/Twig/TwigExtension.php b/system/src/Grav/Common/Twig/TwigExtension.php
index cf906828b..7368948b2 100644
--- a/system/src/Grav/Common/Twig/TwigExtension.php
+++ b/system/src/Grav/Common/Twig/TwigExtension.php
@@ -40,7 +40,7 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
     public function __construct()
     {
         $this->grav     = Grav::instance();
-        $this->debugger = isset($this->grav['debugger']) ? $this->grav['debugger'] : null;
+        $this->debugger = $this->grav['debugger'] ?? null;
         $this->config   = $this->grav['config'];
     }
 
@@ -221,7 +221,7 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
             }
         }
 
-        return str_replace( '@', '&#64;', $email );
+        return str_replace('@', '&#64;', $email);
     }
 
     /**
@@ -234,7 +234,7 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
      */
     public function randomizeFilter($original, $offset = 0)
     {
-        if (!is_array($original)) {
+        if (!\is_array($original)) {
             return $original;
         }
 
@@ -246,7 +246,7 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
         $random = array_slice($original, $offset);
         shuffle($random);
 
-        $sizeOf = count($original);
+        $sizeOf = \count($original);
         for ($x = 0; $x < $sizeOf; $x++) {
             if ($x < $offset) {
                 $sorted[] = $original[$x];
@@ -269,19 +269,15 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
      */
     public function modulusFilter($number, $divider, $items = null)
     {
-        if (is_string($number)) {
+        if (\is_string($number)) {
             $number = strlen($number);
         }
 
         $remainder = $number % $divider;
 
-        if (is_array($items)) {
-            if (isset($items[$remainder])) {
-                return $items[$remainder];
-            }
-
-                return $items[0];
-            }
+        if (\is_array($items)) {
+            return $items[$remainder] ?? $items[0];
+        }
 
         return $remainder;
     }
@@ -307,7 +303,7 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
      */
     public function inflectorFilter($action, $data, $count = null)
     {
-        $action = $action . 'ize';
+        $action .= 'ize';
 
         $inflector = $this->grav['inflector'];
 
@@ -316,18 +312,14 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
             ['titleize', 'camelize', 'underscorize', 'hyphenize', 'humanize', 'ordinalize', 'monthize'],
             true
         )) {
-            return $inflector->$action($data);
+            return $inflector->{$action}($data);
         }
 
         if (\in_array($action, ['pluralize', 'singularize'], true)) {
-            if ($count) {
-                return $inflector->$action($data, $count);
-            }
+            return $count ? $inflector->{$action}($data, $count) : $inflector->{$action}($data);
+        }
 
-                return $inflector->$action($data);
-            }
-
-            return $data;
+        return $data;
     }
 
     /**
@@ -459,8 +451,7 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
      */
     public function cronFunc($at)
     {
-        $cron = CronExpression::factory($at);
-        return $cron;
+        return CronExpression::factory($at);
     }
 
     /**
@@ -480,29 +471,29 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
 
         if ($long_strings) {
             $periods = [
-                "NICETIME.SECOND",
-                "NICETIME.MINUTE",
-                "NICETIME.HOUR",
-                "NICETIME.DAY",
-                "NICETIME.WEEK",
-                "NICETIME.MONTH",
-                "NICETIME.YEAR",
-                "NICETIME.DECADE"
+                'NICETIME.SECOND',
+                'NICETIME.MINUTE',
+                'NICETIME.HOUR',
+                'NICETIME.DAY',
+                'NICETIME.WEEK',
+                'NICETIME.MONTH',
+                'NICETIME.YEAR',
+                'NICETIME.DECADE'
             ];
         } else {
             $periods = [
-                "NICETIME.SEC",
-                "NICETIME.MIN",
-                "NICETIME.HR",
-                "NICETIME.DAY",
-                "NICETIME.WK",
-                "NICETIME.MO",
-                "NICETIME.YR",
-                "NICETIME.DEC"
+                'NICETIME.SEC',
+                'NICETIME.MIN',
+                'NICETIME.HR',
+                'NICETIME.DAY',
+                'NICETIME.WK',
+                'NICETIME.MO',
+                'NICETIME.YR',
+                'NICETIME.DEC'
             ];
         }
 
-        $lengths = ["60", "60", "24", "7", "4.35", "12", "10"];
+        $lengths = ['60', '60', '24', '7', '4.35', '12', '10'];
 
         $now = time();
 
@@ -523,7 +514,7 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
             $difference = $now - $unix_date;
             $tense      = $this->grav['language']->translate('GRAV.NICETIME.AGO', null, true);
 
-        } else if ($now == $unix_date) {
+        } elseif ($now == $unix_date) {
             $difference = $now - $unix_date;
             $tense      = $this->grav['language']->translate('GRAV.NICETIME.JUST_NOW', null, false);
 
@@ -553,13 +544,13 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
         $periods[$j] = $this->grav['language']->translate('GRAV.'.$periods[$j], null, true);
 
         if ($now == $unix_date) {
-            return "{$tense}";
+            return $tense;
         }
 
-        $time = "$difference $periods[$j]";
-        $time = $time . ($show_tense ? " {$tense}" : "");
+        $time = "{$difference} {$periods[$j]}";
+        $time .= $show_tense ? " {$tense}" : '';
 
-        return  $time;
+        return $time;
     }
 
     /**
@@ -570,7 +561,7 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
      */
     public function xssFunc($data)
     {
-        if (is_array($data)) {
+        if (\is_array($data)) {
             $results = Security::detectXssFromArray($data);
         } else {
             return Security::detectXss($data);
@@ -580,7 +571,7 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
             return $key.': \''.$value . '\'';
         }, array_values($results), array_keys($results));
 
-         return implode(', ', $results_parts);
+        return implode(', ', $results_parts);
     }
 
     /**
@@ -885,7 +876,7 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
      *
      * @return string
      */
-    public static function padFilter($input, $pad_length, $pad_string = " ", $pad_type = STR_PAD_RIGHT)
+    public static function padFilter($input, $pad_length, $pad_string = ' ', $pad_type = STR_PAD_RIGHT)
     {
         return str_pad($input, (int)$pad_length, $pad_string, $pad_type);
     }
@@ -1053,7 +1044,8 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
      * @param int $flags
      * @return array
      */
-    public function regexFilter($array, $regex, $flags = 0) {
+    public function regexFilter($array, $regex, $flags = 0)
+    {
         return preg_grep($regex, $array, $flags);
     }
 
@@ -1240,7 +1232,8 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
     public function themeVarFunc($var, $default = null)
     {
         $header = $this->grav['page']->header();
-        $header_classes = isset($header->$var) ? $header->$var : null;
+        $header_classes = $header->{$var} ?? null;
+
         return $header_classes ?: $this->config->get('theme.' . $var, $default);
     }
 
@@ -1255,7 +1248,7 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
     {
 
         $header = $this->grav['page']->header();
-        $body_classes = isset($header->body_classes) ? $header->body_classes : '';
+        $body_classes = $header->body_classes ?? '';
 
         foreach ((array)$classes as $class) {
             if (!empty($body_classes) && Utils::contains($body_classes, $class)) {
@@ -1283,20 +1276,20 @@ class TwigExtension extends \Twig_Extension implements \Twig_Extension_GlobalsIn
         }
 
         // Make sure pages are an array
-        if (!is_array($pages)) {
-            $pages = array($pages);
+        if (!\is_array($pages)) {
+            $pages = [$pages];
         }
 
         // Loop over pages and look for header vars
         foreach ($pages as $page) {
-            if (is_string($page)) {
+            if (\is_string($page)) {
                 $page = $this->grav['pages']->find($page);
             }
 
             if ($page) {
                 $header = $page->header();
-                if (isset($header->$var)) {
-                    return $header->$var;
+                if (isset($header->{$var})) {
+                    return $header->{$var};
                 }
             }
         }
diff --git a/system/src/Grav/Common/Uri.php b/system/src/Grav/Common/Uri.php
index 12d314dda..0c7e30d3c 100644
--- a/system/src/Grav/Common/Uri.php
+++ b/system/src/Grav/Common/Uri.php
@@ -1044,7 +1044,7 @@ class Uri
      */
     public static function addNonce($url, $action, $nonceParamName = 'nonce')
     {
-        $fake = $url && $url[0] === '/';
+        $fake = $url && strpos($url, '/') === 0;
 
         if ($fake) {
             $url = 'http://domain.com' . $url;
diff --git a/system/src/Grav/Common/User/Group.php b/system/src/Grav/Common/User/Group.php
index 11b3e3710..9b3154db0 100644
--- a/system/src/Grav/Common/User/Group.php
+++ b/system/src/Grav/Common/User/Group.php
@@ -38,7 +38,7 @@ class Group extends Data
         $groups = [];
 
         foreach(static::groups() as $groupname => $group) {
-            $groups[$groupname] = isset($group['readableName']) ? $group['readableName'] : $groupname;
+            $groups[$groupname] = $group['readableName'] ?? $groupname;
         }
 
         return $groups;
@@ -67,7 +67,7 @@ class Group extends Data
     {
         $groups = self::groups();
 
-        $content = isset($groups[$groupname]) ? $groups[$groupname] : [];
+        $content = $groups[$groupname] ?? [];
         $content += ['groupname' => $groupname];
 
         $blueprints = new Blueprints;
diff --git a/system/src/Grav/Common/Utils.php b/system/src/Grav/Common/Utils.php
index 96c1b1899..1a1bae1aa 100644
--- a/system/src/Grav/Common/Utils.php
+++ b/system/src/Grav/Common/Utils.php
@@ -9,7 +9,6 @@
 
 namespace Grav\Common;
 
-use DateTime;
 use Grav\Common\Helpers\Truncator;
 use Grav\Common\Page\Page;
 use Grav\Common\Markdown\Parsedown;
@@ -226,9 +225,7 @@ abstract class Utils
         $startString = mb_substr($original, 0, $position, "UTF-8");
         $endString = mb_substr($original, $position + $length, mb_strlen($original), "UTF-8");
 
-        $out = $startString . $replacement . $endString;
-
-        return $out;
+        return $startString . $replacement . $endString;
     }
 
     /**
@@ -320,7 +317,10 @@ abstract class Utils
      */
     public static function arrayIsAssociative($arr)
     {
-        if (array() === $arr) return false;
+        if ([] === $arr) {
+            return false;
+        }
+
         return array_keys($arr) !== range(0, count($arr) - 1);
     }
 
@@ -331,7 +331,7 @@ abstract class Utils
      */
     public static function dateFormats()
     {
-        $now = new DateTime();
+        $now = new \DateTime();
 
         $date_formats = [
             'd-m-Y H:i' => 'd-m-Y H:i (e.g. '.$now->format('d-m-Y H:i').')',
@@ -359,7 +359,7 @@ abstract class Utils
      *
      * @return string
      */
-    public static function truncate($string, $limit = 150, $up_to_break = false, $break = " ", $pad = "&hellip;")
+    public static function truncate($string, $limit = 150, $up_to_break = false, $break = ' ', $pad = '&hellip;')
     {
         // return with no change if string is shorter than $limit
         if (mb_strlen($string) <= $limit) {
@@ -735,7 +735,7 @@ abstract class Utils
      */
     public static function normalizePath($path)
     {
-        $root = ($path[0] === '/') ? '/' : '';
+        $root = strpos($path, '/') === 0 ? '/' : '';
 
         $segments = explode('/', trim($path, '/'));
         $ret = [];
@@ -762,7 +762,7 @@ abstract class Utils
      */
     public static function isFunctionDisabled($function)
     {
-        return in_array($function, explode(',', ini_get('disable_functions')), true);
+        return \in_array($function, explode(',', ini_get('disable_functions')), true);
     }
 
     /**
@@ -774,7 +774,7 @@ abstract class Utils
     {
         $timezones = \DateTimeZone::listIdentifiers(\DateTimeZone::ALL);
         $offsets = [];
-        $testDate = new \DateTime;
+        $testDate = new \DateTime();
 
         foreach ($timezones as $zone) {
             $tz = new \DateTimeZone($zone);
@@ -830,7 +830,7 @@ abstract class Utils
     public static function arrayFlatten($array)
     {
         $flatten = array();
-        foreach ($array as $key => $inner){
+        foreach ($array as $key => $inner) {
             if (is_array($inner)) {
                 foreach ($inner as $inner_key => $value) {
                     $flatten[$inner_key] = $value;
@@ -853,14 +853,10 @@ abstract class Utils
     public static function arrayFlattenDotNotation($array, $prepend = '')
     {
         $results = array();
-        foreach ($array as $key => $value)
-        {
-            if (is_array($value))
-            {
+        foreach ($array as $key => $value) {
+            if (is_array($value)) {
                 $results = array_merge($results, static::arrayFlattenDotNotation($value, $prepend.$key.'.'));
-            }
-            else
-            {
+            } else {
                 $results[$prepend.$key] = $value;
             }
         }
@@ -875,14 +871,17 @@ abstract class Utils
      * @param string $separator
      * @return array
      */
-    public static function arrayUnflattenDotNotation($array, $separator = '.') {
-        $newArray = array();
-        foreach($array as $key => $value) {
+    public static function arrayUnflattenDotNotation($array, $separator = '.')
+    {
+        $newArray = [];
+        foreach ($array as $key => $value) {
             $dots = explode($separator, $key);
-            if(count($dots) > 1) {
-                $last = &$newArray[ $dots[0] ];
-                foreach($dots as $k => $dot) {
-                    if($k == 0) continue;
+            if (\count($dots) > 1) {
+                $last = &$newArray[$dots[0]];
+                foreach ($dots as $k => $dot) {
+                    if ($k === 0) {
+                        continue;
+                    }
                     $last = &$last[$dot];
                 }
                 $last = $value;
@@ -909,7 +908,7 @@ abstract class Utils
 
         $languages_enabled = Grav::instance()['config']->get('system.languages.supported', []);
 
-        if ($string[0] === '/' && $string[3] === '/' && in_array(substr($string, 1, 2), $languages_enabled)) {
+        if ($string[0] === '/' && $string[3] === '/' && \in_array(substr($string, 1, 2), $languages_enabled, true)) {
             return true;
         }
 
@@ -931,9 +930,9 @@ abstract class Utils
 
         // try to use DateTime and default format
         if ($dateformat) {
-            $datetime = DateTime::createFromFormat($dateformat, $date);
+            $datetime = \DateTime::createFromFormat($dateformat, $date);
         } else {
-            $datetime = new DateTime($date);
+            $datetime = new \DateTime($date);
         }
 
         // fallback to strtotime() if DateTime approach failed
@@ -1057,12 +1056,8 @@ abstract class Utils
 
         //Nonce generated 12-24 hours ago
         $previousTick = true;
-        if ($nonce === self::getNonce($action, $previousTick)) {
-            return true;
-        }
 
-        //Invalid nonce
-        return false;
+        return $nonce === self::getNonce($action, $previousTick);
     }
 
     /**
@@ -1196,7 +1191,7 @@ abstract class Utils
      * @param int $sort_flags
      * @return array
      */
-    public static function sortArrayByKey($array, $array_key, $direction = SORT_DESC, $sort_flags = SORT_REGULAR )
+    public static function sortArrayByKey($array, $array_key, $direction = SORT_DESC, $sort_flags = SORT_REGULAR)
     {
         $output = [];
 
@@ -1295,13 +1290,14 @@ abstract class Utils
      * @return integer Returns only the number of units, not the type letter. Returns 0 if the $to unit type is out of scope.
      *
      */
-    public static function convertSize($bytes, $to, $decimal_places = 1) {
+    public static function convertSize($bytes, $to, $decimal_places = 1)
+    {
         $formulas = array(
             'K' => number_format($bytes / 1024, $decimal_places),
             'M' => number_format($bytes / 1048576, $decimal_places),
             'G' => number_format($bytes / 1073741824, $decimal_places)
         );
-        return isset($formulas[$to]) ? $formulas[$to] : 0;
+        return $formulas[$to] ?? 0;
     }
 
     /**
@@ -1311,7 +1307,8 @@ abstract class Utils
      * @param int $precision
      * @return string
      */
-    public static function prettySize($bytes, $precision = 2) {
+    public static function prettySize($bytes, $precision = 2)
+    {
         $units = array('B', 'KB', 'MB', 'GB', 'TB');
 
         $bytes = max($bytes, 0);
diff --git a/system/src/Grav/Console/Cli/BackupCommand.php b/system/src/Grav/Console/Cli/BackupCommand.php
index cb0f418b7..31deb19c5 100644
--- a/system/src/Grav/Console/Cli/BackupCommand.php
+++ b/system/src/Grav/Console/Cli/BackupCommand.php
@@ -103,7 +103,7 @@ class BackupCommand extends ConsoleCommand
         switch ($args['type']) {
             case 'count':
                 $steps = $args['steps'];
-                $freq = intval($steps > 100 ? round($steps / 100) : $steps);
+                $freq = (int)($steps > 100 ? round($steps / 100) : $steps);
                 $this->progress->setMaxSteps($steps);
                 $this->progress->setRedrawFrequency($freq);
                 $this->progress->setMessage('Adding files...');
diff --git a/system/src/Grav/Console/Gpm/IndexCommand.php b/system/src/Grav/Console/Gpm/IndexCommand.php
index c3d3a2273..fdefec7cf 100644
--- a/system/src/Grav/Console/Gpm/IndexCommand.php
+++ b/system/src/Grav/Console/Gpm/IndexCommand.php
@@ -190,7 +190,7 @@ class IndexCommand extends ConsoleCommand
      */
     private function installed($package)
     {
-        $package   = isset($list[$package->slug]) ? $list[$package->slug] : $package;
+        $package   = $list[$package->slug] ?? $package;
         $type      = ucfirst(preg_replace('/s$/', '', $package->package_type));
         $method = 'is' . $type . 'Installed';
         $installed = $this->gpm->{$method}($package->slug);