Server::$worker_id

得到当前Worker进程的编号，包括Task进程。

int $server->worker_id;

这个属性与onWorkerStart时的$worker_id是相同的。

• Worker进程编号范围是[0, $serv->setting['worker_num']]
• Task进程编号范围是[$serv->setting['worker_num'], $serv->setting['worker_num'] + $serv->setting['task_worker_num']]

工作进程重启后worker_id的值是不变的