public static function destroySessionIfNotAllowed(){
        if (!self::isAllowedSession() && ini_get("session.use_cookies") && session_status() == PHP_SESSION_ACTIVE) {
            $params = session_get_cookie_params();
            setcookie(session_name(), '', time() - 42000,
                $params["path"], $params["domain"],
                $params["secure"], $params["httponly"]
            );
        }
    }