PHP Encryption Class

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<?phpnamespace app\index\controller;class crypt{Private $key = ""; Public function __construct ($key = null) {if (!is_null ($key)) {$this->key =                                $key; }}//Cryptographic function Public Function Passport_encrypt ($txt) {srand (double) microtime () * 10                     00000);                     $encrypt _key = MD5 (rand (0, 32000));                     $ctr = 0;                     $tmp = ";                                     for ($i = 0; $i < strlen ($txt); $i + +) {$ctr = $ctr = = strlen ($encrypt _key)? 0: $ctr; $tmp. = $encrypt _key[$ctr].                                 ($txt [$i] ^ $encrypt _key[$ctr + +]);            } return UrlEncode (Base64_encode ($this->passport_key ($tmp, $this->key)); }//Decryption function Public function Passport_decrypt ($txt) {$txt = $this-&GT;PASSP Ort_kEY (Base64_decode (UrlDecode ($txt)), $this->key);                $tmp = ";                                for ($i = 0; $i < strlen ($txt); $i + +) {$MD 5 = $txt [$i];                            $tmp. = $txt [+ + $i] ^ $MD 5;           } return $tmp;               } Private Function Passport_key ($txt, $encrypt _key) {$encrypt _key = MD5 ($encrypt _key);               $ctr = 0;               $tmp = ";                               for ($i = 0; $i < strlen ($txt); $i + +) {$ctr = $ctr = = strlen ($encrypt _key)? 0: $ctr;                           $tmp. = $txt [$i] ^ $encrypt _key[$ctr + +];                       } return $tmp; }           }