/**
* 用户注销登录
* @param string $packid 客户端的包ID
* @param bool $send_notice 是否发送登录通知
* @return bool 如果已登录返回true，否则返回false
*/
protected static function logged($packid, $send_notice = true)
{
$logged = Message::logged();
if (!$logged && $send_notice) {
self::sendDataToCurrentClient('login', $packid, 1003, 'Not logged in');
}
return $logged;
}
