swoole_server::$worker_pid

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int $serv->worker_pid;

$serv->on('workerStart', function($serv, $worker_id) {  
    echo "WorkerStart: MasterPid={$serv->master_pid}|Manager_pid={$serv->manager_pid}|
            WorkerId={$serv->worker_id}|WorkerPid={$serv->worker_pid}\n";  
});