public static function ValidateUserName($userName, &$errors) { $return = false; if (Value::SetAndNotNull($userName)) { if (strlen($userName) >= 5) { if (!User::CheckIfExits($userName)) { $return = true; } else { $errors[] = "Username already exits!"; } } else { $errors[] = "Username is too short!"; } } else { $errors[] = "Username need to be filled out!"; } return $return; }