message: update length_protocol.phpt
diff: @@ -79,19 +79,12 @@ $pm->parentFunc = function ($pid)
  swoole_process::kill($pid);
  };
  -$pm->childFunc = function () use ($pm)
  -{
  - $serv = new \swoole_server(UDP_SERVER_HOST, UDP_SERVER_PORT, SWOOLE_BASE, SWOOLE_SOCK_UDP);
  - $serv->set(["worker_num" => 1, 'log_file' => '/dev/null']);
  - $serv->on("WorkerStart", function (\swoole_server $serv) use ($pm)
  - {
  - $pm->wakeup();
  - });
  -
  +$pm->childFunc = function () use ($pm) {
  $serv = new PkgServer(true);
  $serv->set([
  'worker_num' => 1,
  //'dispatch_mode' => 1,
  + 'log_file' => '/dev/null',
  'open_length_check' => true,
  'package_max_length' => 1024 * 1024,
  'package_length_type' => 'N',
  