bug：创建若干个子进程后，按ctrl+c，部分子进程不会被关闭

$http_worker = new Worker("http://0.0.0.0:23451");

$http_worker->count = 1;
$http_worker->onWorkerStart = function($worker)
{
    echo "Worker starting...\n";
    Timer::add(3, function()
    {
        $pid = pcntl_fork();
        if ($pid == -1) {
        } elseif ($pid==0) { //子进程$pid是0
            echo '子进程2';//return ;
        }
    },[],true);
    echo '主进程2';
    return;
};
// 运行worker
Worker::runAll();