public function clearCookie($domain = '-', $path = null)
    {
        if ($domain === null) {
            $this->_cookies = [];
        } else {
            $domain = strtolower($domain);
            if ($path === null) {
                unset($this->_cookies[$domain]);
            } else {
                if (isset($this->_cookies[$domain])) {
                    unset($this->_cookies[$domain][$path]);
                }
            }
        }
    }