public function destroySession()
    {
        if ($this->_is_session_initialized) {
            $_SESSION = array();
            if (isset($_COOKIE[$this->name])) {
                setcookie($this->name/*session_name()*/, '', time() - 42000, '/');
            }
            session_destroy();
            $this->_is_session_initialized = false;
        }
    }