diff --git a/admin.php b/admin.php
index 3c0fd923..b19d3cc4 100644
--- a/admin.php
+++ b/admin.php
@@ -119,12 +119,11 @@ class AdminPlugin extends Plugin
      * - 'password1' for password format
      * - 'password2' for equality to password1
      *
-     * @param object $form      The form
      * @param string $type      The field type
      * @param string $value     The field value
      * @param string $extra     Any extra value required
      *
-     * @return mixed
+     * @return bool
      */
     protected function validate($type, $value, $extra = '')
     {
@@ -134,22 +133,21 @@ class AdminPlugin extends Plugin
                     return false;
                 }
                 return true;
-                break;
 
             case 'password1':
                 if (!preg_match('/(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}/', $value)) {
                     return false;
                 }
                 return true;
-                break;
 
             case 'password2':
                 if (strcmp($value, $extra)) {
                     return false;
                 }
                 return true;
-                break;
         }
+
+        return false;
     }
 
     /**
@@ -352,6 +350,8 @@ class AdminPlugin extends Plugin
                     return $page;
                 }
             }
+
+            return null;
         };
 
         if (empty($this->grav['page'])) {
diff --git a/classes/admin.php b/classes/admin.php
index 2ad43c7e..b336a37d 100644
--- a/classes/admin.php
+++ b/classes/admin.php
@@ -15,7 +15,6 @@ use Grav\Common\User\User;
 use Grav\Common\Utils;
 use RocketTheme\Toolbox\File\File;
 use RocketTheme\Toolbox\File\JsonFile;
-use RocketTheme\Toolbox\File\LogFile;
 use RocketTheme\Toolbox\ResourceLocator\UniformResourceLocator;
 use RocketTheme\Toolbox\Session\Message;
 use RocketTheme\Toolbox\Session\Session;
@@ -71,12 +70,7 @@ class Admin
     public $user;
 
     /**
-     * @var Lang
-     */
-    protected $lang;
-
-    /**
-     * @var Grav\Common\GPM\GPM
+     * @var GPM
      */
     protected $gpm;
 
@@ -458,7 +452,7 @@ class Admin
         $gpm = $this->gpm();
 
         if (!$gpm) {
-            return;
+            return false;
         }
 
         return $local ? $gpm->getInstalledPlugins() : $gpm->getRepositoryPlugins()->filter(function (
@@ -479,7 +473,7 @@ class Admin
         $gpm = $this->gpm();
 
         if (!$gpm) {
-            return;
+            return false;
         }
 
         return $local ? $gpm->getInstalledThemes() : $gpm->getRepositoryThemes()->filter(function ($package, $slug) use
@@ -496,7 +490,7 @@ class Admin
      *
      * @param  integer $count number of pages to pull back
      *
-     * @return array
+     * @return array|null
      */
     public function latestPages($count = 10)
     {
@@ -506,7 +500,7 @@ class Admin
         $latest = array();
 
         if(is_null($pages->routes())){
-            return;
+            return null;
         }
 
         foreach ($pages->routes() as $url => $path) {
@@ -824,13 +818,21 @@ class Admin
     /**
      * Translate a string to the user-defined language
      *
-     * @param $string the string to translate
+     * @param string $string the string to translate
+     * @return string
      */
     public function translate($string)
     {
         return $this->_translate($string, [$this->grav['user']->authenticated ? $this->grav['user']->language : 'en']);
     }
 
+    /**
+     * @param array|mixed $args
+     * @param array|null $languages
+     * @param bool $array_support
+     * @param bool $html_out
+     * @return string
+     */
     public function _translate($args, Array $languages = null, $array_support = false, $html_out = false)
     {
         if (is_array($args)) {
@@ -878,6 +880,10 @@ class Admin
         return $lookup;
     }
 
+    /**
+     * @param string $php_format
+     * @return string
+     */
     function dateformat2Kendo($php_format)
     {
         $SYMBOLS_MATCHING = array(
diff --git a/classes/controller.php b/classes/controller.php
index f0dfdc03..6493288b 100644
--- a/classes/controller.php
+++ b/classes/controller.php
@@ -8,7 +8,7 @@ use Grav\Common\GPM\Installer;
 use Grav\Common\Grav;
 use Grav\Common\Uri;
 use Grav\Common\Data;
-use Grav\Common\Page;
+use Grav\Common\Page\Page;
 use Grav\Common\Page\Pages;
 use Grav\Common\Page\Collection;
 use Grav\Common\Plugin;
@@ -16,8 +16,6 @@ use Grav\Common\Theme;
 use Grav\Common\User\User;
 use Grav\Common\Utils;
 use Grav\Common\Backup\ZipBackup;
-use Grav\Common\Markdown\Parsedown;
-use Grav\Common\Markdown\ParsedownExtra;
 use RocketTheme\Toolbox\File\File;
 use RocketTheme\Toolbox\File\JsonFile;
 use Symfony\Component\Yaml\Yaml;
@@ -380,7 +378,7 @@ class AdminController
     protected function taskClearCache()
     {
         if (!$this->authorizeTask('clear cache', ['admin.cache', 'admin.super'])) {
-            return;
+            return false;
         }
 
         // get optional cleartype param
@@ -411,7 +409,7 @@ class AdminController
     {
         $param_sep = $this->grav['config']->get('system.param_sep', ':');
         if (!$this->authorizeTask('backup', ['admin.maintenance', 'admin.super'])) {
-            return;
+            return false;
         }
 
         $download = $this->grav['uri']->param('download');
@@ -562,7 +560,7 @@ class AdminController
     protected function taskListmedia()
     {
         if (!$this->authorizeTask('list media', ['admin.pages', 'admin.super'])) {
-            return;
+            return false;
         }
 
         $page = $this->admin->page(true);
@@ -583,11 +581,13 @@ class AdminController
 
     /**
      * Handles adding a media file to a page
+     *
+     * @return bool True if the action was performed.
      */
     protected function taskAddmedia()
     {
         if (!$this->authorizeTask('add media', ['admin.pages', 'admin.super'])) {
-            return;
+            return false;
         }
 
         $page = $this->admin->page(true);
@@ -597,7 +597,7 @@ class AdminController
 
         if (!isset($_FILES['file']['error']) || is_array($_FILES['file']['error'])) {
             $this->admin->json_response = ['status' => 'error', 'message' => $this->admin->translate('PLUGIN_ADMIN.INVALID_PARAMETERS')];
-            return;
+            return false;
         }
 
         // Check $_FILES['file']['error'] value.
@@ -606,21 +606,21 @@ class AdminController
                 break;
             case UPLOAD_ERR_NO_FILE:
                 $this->admin->json_response = ['status' => 'error', 'message' => $this->admin->translate('PLUGIN_ADMIN.NO_FILES_SENT')];
-                return;
+                return false;
             case UPLOAD_ERR_INI_SIZE:
             case UPLOAD_ERR_FORM_SIZE:
                 $this->admin->json_response = ['status' => 'error', 'message' => $this->admin->translate('PLUGIN_ADMIN.EXCEEDED_FILESIZE_LIMIT')];
-                return;
+                return false;
             default:
                 $this->admin->json_response = ['status' => 'error', 'message' => $this->admin->translate('PLUGIN_ADMIN.UNKNOWN_ERRORS')];
-                return;
+                return false;
         }
 
         $grav_limit = $config->get('system.media.upload_limit', 0);
         // You should also check filesize here.
         if ($grav_limit > 0 && $_FILES['file']['size'] > $grav_limit) {
             $this->admin->json_response = ['status' => 'error', 'message' => $this->admin->translate('PLUGIN_ADMIN.EXCEEDED_GRAV_FILESIZE_LIMIT')];
-            return;
+            return false;
         }
 
 
@@ -631,19 +631,19 @@ class AdminController
         // If not a supported type, return
         if (!$config->get("media.{$fileExt}")) {
             $this->admin->json_response = ['status' => 'error', 'message' => $this->admin->translate('PLUGIN_ADMIN.UNSUPPORTED_FILE_TYPE') . ': '.$fileExt];
-            return;
+            return false;
         }
 
 
         // Upload it
         if (!move_uploaded_file($_FILES['file']['tmp_name'], sprintf('%s/%s', $page->path(), $_FILES['file']['name']))) {
             $this->admin->json_response = ['status' => 'error', 'message' => $this->admin->translate('PLUGIN_ADMIN.FAILED_TO_MOVE_UPLOADED_FILE')];
-            return;
+            return false;
         }
 
         $this->admin->json_response = ['status' => 'success', 'message' => $this->admin->translate('PLUGIN_ADMIN.FILE_UPLOADED_SUCCESSFULLY')];
 
-        return;
+        return true;
     }
 
     /**
@@ -654,7 +654,7 @@ class AdminController
     protected function taskDelmedia()
     {
         if (!$this->authorizeTask('delete media', ['admin.pages', 'admin.super'])) {
-            return;
+            return false;
         }
 
         $page = $this->admin->page(true);
@@ -709,6 +709,8 @@ class AdminController
 
     /**
      * Process the page Markdown
+     *
+     * @return bool True if the action was performed.
      */
     protected function taskProcessMarkdown()
     {
@@ -734,11 +736,13 @@ class AdminController
             $html = $page->content();
 
             $this->admin->json_response = ['status' => 'success', 'message' => $html];
-            return true;
         } catch (\Exception $e) {
             $this->admin->json_response = ['status' => 'error', 'message' => $e->getMessage()];
+
             return false;
         }
+
+        return true;
     }
 
     /**
@@ -749,7 +753,7 @@ class AdminController
     public function taskEnable()
     {
         if (!$this->authorizeTask('enable plugin', ['admin.plugins', 'admin.super'])) {
-            return;
+            return false;
         }
 
         if ($this->view != 'plugins') {
@@ -775,7 +779,7 @@ class AdminController
     public function taskDisable()
     {
         if (!$this->authorizeTask('disable plugin', ['admin.plugins', 'admin.super'])) {
-            return;
+            return false;
         }
 
         if ($this->view != 'plugins') {
@@ -801,7 +805,7 @@ class AdminController
     public function taskActivate()
     {
         if (!$this->authorizeTask('activate theme', ['admin.themes', 'admin.super'])) {
-            return;
+            return false;
         }
 
         if ($this->view != 'themes') {
@@ -840,7 +844,7 @@ class AdminController
     {
         $type = $this->view === 'plugins' ? 'plugins' : 'themes';
         if (!$this->authorizeTask('install ' . $type, ['admin.' . $type, 'admin.super'])) {
-            return;
+            return false;
         }
 
         require_once __DIR__ . '/gpm.php';
@@ -915,7 +919,7 @@ class AdminController
 
         foreach ($permissions as $type => $p) {
             if (!$this->authorizeTask('update ' . $type , $p)) {
-                return;
+                return false;
             }
         }
 
@@ -951,7 +955,7 @@ class AdminController
     {
         $type = $this->view === 'plugins' ? 'plugins' : 'themes';
         if (!$this->authorizeTask('uninstall ' . $type, ['admin.' . $type, 'admin.super'])) {
-            return;
+            return false;
         }
 
         require_once __DIR__ . '/gpm.php';
@@ -971,6 +975,11 @@ class AdminController
         return true;
     }
 
+    /**
+     * @param string $key
+     * @param string $file
+     * @return bool
+     */
     private function cleanFilesData($key, $file)
     {
         $config  = $this->grav['config'];
@@ -1031,6 +1040,11 @@ class AdminController
         return $cleanFiles[$key];
     }
 
+    /**
+     * @param string $needle
+     * @param array|string $haystack
+     * @return bool
+     */
     private function match_in_array($needle, $haystack)
     {
         foreach ((array)$haystack as $item) {
@@ -1042,6 +1056,10 @@ class AdminController
         return false;
     }
 
+    /**
+     * @param mixed $obj
+     * @return mixed
+     */
     private function processFiles($obj)
     {
         foreach ((array)$_FILES as $key => $file) {
@@ -1062,17 +1080,17 @@ class AdminController
     public function taskSave()
     {
         if (!$this->authorizeTask('save', $this->dataPermissions())) {
-            return;
+            return false;
         }
 
-        $reorder = false;
         $data = $this->post;
 
+        $config = $this->grav['config'];
+
         // Special handler for pages data.
         if ($this->view == 'pages') {
-            /** @var Page\Pages $pages */
+            /** @var Pages $pages */
             $pages = $this->grav['pages'];
-            $config = $this->grav['config'];
 
             // Find new parent page in order to build the path.
             $route = !isset($data['route']) ? dirname($this->admin->route) : $data['route'];
@@ -1150,7 +1168,7 @@ class AdminController
         }
 
         // Always redirect if a page route was changed, to refresh it
-        if ($obj instanceof Page\Page) {
+        if ($obj instanceof Page) {
             if (method_exists($obj, 'unsetRouteSlug')) {
                 $obj->unsetRouteSlug();
             }
@@ -1234,7 +1252,7 @@ class AdminController
     protected function taskCopy()
     {
         if (!$this->authorizeTask('copy page', ['admin.pages', 'admin.super'])) {
-            return;
+            return false;
         }
 
         // Only applies to pages.
@@ -1243,7 +1261,7 @@ class AdminController
         }
 
         try {
-            /** @var Page\Pages $pages */
+            /** @var Pages $pages */
             $pages = $this->grav['pages'];
             $data = $this->post;
 
@@ -1292,7 +1310,7 @@ class AdminController
     protected function taskReorder()
     {
         if (!$this->authorizeTask('reorder pages', ['admin.pages', 'admin.super'])) {
-            return;
+            return false;
         }
 
         // Only applies to pages.
@@ -1313,7 +1331,7 @@ class AdminController
     protected function taskDelete()
     {
         if (!$this->authorizeTask('delete page', ['admin.pages', 'admin.super'])) {
-            return;
+            return false;
         }
 
         // Only applies to pages.
@@ -1390,7 +1408,7 @@ class AdminController
     protected function taskSaveas()
     {
         if (!$this->authorizeTask('save', $this->dataPermissions())) {
-            return;
+            return false;
         }
 
         // $reorder = false;
@@ -1428,7 +1446,7 @@ class AdminController
             $aFile = File::instance($path);
             $aFile->save();
 
-            $aPage = new Page\Page();
+            $aPage = new Page();
             $aPage->init(new \SplFileInfo($path), $language .'.md');
             $aPage->header($obj->header());
             $aPage->rawMarkdown($obj->rawMarkdown());
diff --git a/classes/gpm.php b/classes/gpm.php
index 38b72757..17d86742 100644
--- a/classes/gpm.php
+++ b/classes/gpm.php
@@ -36,7 +36,12 @@ class Gpm
         'theme'           => false
     ];
 
-    public static function install($packages, $options)
+    /**
+     * @param Package[]|string[]|string $packages
+     * @param array $options
+     * @return bool
+     */
+    public static function install($packages, array $options)
     {
         $options = array_merge(self::$options, $options);
 
@@ -93,13 +98,24 @@ class Gpm
         return true;
     }
 
-    public static function update($packages, $options)
+    /**
+     * @param Package[]|string[]|string $packages
+     * @param array $options
+     * @return bool
+     */
+    public static function update($packages, array $options)
     {
         $options['overwrite'] = true;
+
         return static::install($packages, $options);
     }
 
-    public static function uninstall($packages, $options)
+    /**
+     * @param Package[]|string[]|string $packages
+     * @param array $options
+     * @return bool
+     */
+    public static function uninstall($packages, array $options)
     {
         $options = array_merge(self::$options, $options);
 
@@ -144,7 +160,11 @@ class Gpm
         return true;
     }
 
-    private static function download($package)
+    /**
+     * @param Package $package
+     * @return string
+     */
+    private static function download(Package $package)
     {
         $contents = Response::get($package->zipball_url, []);
 
@@ -159,7 +179,12 @@ class Gpm
         return $cache_dir . DS . $filename . '.zip';
     }
 
-    private static function _downloadSelfupgrade($package, $tmp)
+    /**
+     * @param array $package
+     * @param string $tmp
+     * @return string
+     */
+    private static function _downloadSelfupgrade(array $package, $tmp)
     {
         $output = Response::get($package['download'], []);
         Folder::mkdir($tmp);
@@ -167,6 +192,9 @@ class Gpm
         return $tmp . DS . $package['name'];
     }
 
+    /**
+     * @return bool
+     */
     public static function selfupgrade()
     {
         $upgrader = new Upgrader();
diff --git a/classes/popularity.php b/classes/popularity.php
index 71555a0f..e2a583e5 100644
--- a/classes/popularity.php
+++ b/classes/popularity.php
@@ -110,6 +110,9 @@ class Popularity
         file_put_contents($this->daily_file, json_encode($this->daily_data));
     }
 
+    /**
+     * @return array
+     */
     public function getDailyChartData()
     {
         if (!$this->daily_data) {
@@ -130,6 +133,9 @@ class Popularity
         return array('labels' => json_encode($labels), 'data' => json_encode($data));
     }
 
+    /**
+     * @return int
+     */
     public function getDailyTotal()
     {
         if (!$this->daily_data) {
@@ -143,6 +149,9 @@ class Popularity
         }
     }
 
+    /**
+     * @return int
+     */
     public function getWeeklyTotal()
     {
         if (!$this->daily_data) {
@@ -160,6 +169,9 @@ class Popularity
         return $total;
     }
 
+    /**
+     * @return int
+     */
     public function getMonthlyTotal()
     {
         if (!$this->monthly_data) {
@@ -197,6 +209,9 @@ class Popularity
         file_put_contents($this->monthly_file, json_encode($this->monthly_data));
     }
 
+    /**
+     * @return array
+     */
     protected function getMonthyChartData()
     {
         if (!$this->monthly_data) {
@@ -213,6 +228,9 @@ class Popularity
         return array('labels' => $labels, 'data' => $data);
     }
 
+    /**
+     * @param string $url
+     */
     protected function updateTotals($url)
     {
         if (!$this->totals_data) {
@@ -229,6 +247,9 @@ class Popularity
         file_put_contents($this->totals_file, json_encode($this->totals_data));
     }
 
+    /**
+     * @param string $ip
+     */
     protected function updateVisitors($ip)
     {
         if (!$this->visitors_data) {
@@ -246,6 +267,10 @@ class Popularity
         file_put_contents($this->visitors_file, json_encode($this->visitors_data));
     }
 
+    /**
+     * @param string $path
+     * @return array
+     */
     protected function getData($path)
     {
         if (file_exists($path)) {