Simply Encode/Decode string with Cesar algorithm

// file: passwordSecurity.php <?php class passwordSecurity { public function __construct () { return; } public static function encode ($M) { $C = ""; for($i = 0; $i < strlen ($M); $i++) $C.= chr((ord($M[$i]) + 3) % 255); return $C; } public static function decode ($C) { $M = ""; for($i = 0; $i < strlen($C); $i++) $M.= chr((ord($C[$i]) - 3 + 255) % 255); return $M; } } // file: where you need it include ("path to passwordSecurity.php"); $password = "my secret password"; $password_encode = passwordSecurity::encode($password); $password_decode = passwordSecurity::decode($password_encode);