自定义类没有运行onWorkerStart

$WeChat = new WeChatWorker();
// worker名称
$WeChat->name = 'WeChatWorker';
// Worker进程数量
$WeChat->count = 10;

$WeChat->onWorkerStart = function($WeChat) {
    echo 'process '.getmypid(). ' start'."\n";
    $WeChat->start();
};