public function register($username, $password, $email, $bio, $profile_picture = NULL, $rights = 1) {
        $valid_email_pattern  = '/^(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){255,})(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){65,}@)(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22))(?:\\.(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22)))*@(?:(?:(?!.*[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-+[a-z0-9]+)*\\.){1,126}){1,}(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-+[a-z0-9]+)*)|(?:\\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.*[a-f0-9][:\\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))|(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)|(?:(?!(?:.*[a-f0-9]:){5,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))(?:\\.(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))){3}))\\]))$/iD';
        // src = Michael Rushton
        /*
        Feel free to use and redistribute this code. But please keep this copyright notice.
        */

    	if(self::$handler->isLoggedin() === true) {// the user is already logged in there for he can not register.
    	 	$_SESSION['errorarray']["register"]["logged"] = "You mustn't be logged in";
    	}
    	if($password == "") {// the password is not set.
    		$_SESSION['errorarray']["register"]["password"] = "You must chose a password";
    	}
    	if($username == "") {// the username is not set so he must enter it.
    		$_SESSION['errorarray']["register"]["username"] = "You must enter a username";
    	}
    	if(count(
            Database::getInstance()->select(
                array(
                    "user" => array("user_ID")
                ),
                array(
                    array("`user_username`", "=", $username)
                )
            )->fetchAll(PDO::FETCH_ASSOC)) > 0) {
    		$_SESSION['errorarray']["register"]["username-allowed"] = "There already is a user with this username";
        }
    	if($email == "") {
    		$_SESSION['errorarray']["register"]["email"] = "You have to enter an e-mail adress";
    	}
    	if(!isset($_SESSION['errorarray']["register"]["email"])){
    		$_SESSION['errorarray']["register"]["email-valid"] = "You have to enter a valid e-mail adress";
    	}
    	if(preg_match($valid_email_pattern, $email)  != 1){

    		$_SESSION['errorarray']["register"]["email-valid"] = "You have to enter an e-mail adress";
    	}
    	if(count($_SESSION['errorarray']["register"]) === 0){
            $user_array =  array(
                "user_username" => $username,
                "user_password" => Cryptography::hashPassword($password),
                "user_email" => $email,
                "rights_ID" => $rights
            );
           //var_dump($profile_picture);

/*            Database::getInstance()->insert(
                "user", $user_array
            );*/
    	}

    }