php token命令的简单实现，可用于网站平台的对接

tp框架：   

private function checkAuth()

    {
        $password = C('SERVIE_PASSWOED');//网站的密钥；

        if (!empty($_GET)) {
            ksort($_GET);
            $param = '';
            foreach ($_GET as $key => $value) {
                if ($key != 'token') {
                    $param .= $value;
                }
            }

            $param.= $password;

            if (md5($param) != $_GET['token']) {
                return false;
            } else {
                if ((time() - $_GET['time']) > 60) {
                    return false;
                }
            }
        }

        return true;
    }