PHPStan: Fix level 6 errors

adminer/include/tmpfile.inc.php

@@ -2,18 +2,23 @@
 namespace Adminer;
 
 class TmpFile {
-	private $handler;
-	public $size; ///< @visibility protected(set)
+	/** @var resource */ private $handler;
+	/** @var int @visibility protected(set) */ public $size;
 
 	function __construct() {
 		$this->handler = tmpfile();
 	}
 
+	/**
+	* @param string
+	* @return void
+	*/
 	function write($contents) {
 		$this->size += strlen($contents);
 		fwrite($this->handler, $contents);
 	}
 
+	/** @return void */
 	function send() {
 		fseek($this->handler, 0);
 		fpassthru($this->handler);