wm怎么找到好友的状态原理

protected static function sendUdpAndRecv($address , $data)
   {
       $buffer = GatewayProtocol::encode($data);
       // 非workerman环境，使用udp发送数据
       $client = stream_socket_client("udp://$address", $errno, $errmsg);
       if(strlen($buffer) == stream_socket_sendto($client, $buffer))
       {
           // 阻塞读
           stream_set_blocking($client, 1);
           // 1秒超时
           stream_set_timeout($client, 1);
           // 读udp数据
           $data = fread($client, 655350);
           // 返回结果
           return json_decode($data, true);
       }
       else
       {
           throw new \Exception("sendUdpAndRecv($address, \$bufer) fail ! Can not send UDP data!", 502);
       }
   }