function my_onTask(swoole_server $serv, $task_id, $from_id, $data) { list($str, $fd) = explode('-', $data); if ($serv->exist($fd)) { echo 'FD[' . $fd . '] exist' . PHP_EOL; } else { echo 'FD[' . $fd . '] not exist' . PHP_EOL; } echo "Task[PID=" . $serv->worker_pid . "]: task_id={$task_id}." . PHP_EOL; return $data; }