文檔示例的代碼是用定時(shí)器去獲取心跳包超時(shí)了沒有，但是我加了打印發(fā)現(xiàn)判斷空的這個(gè)一直沒有打印出來。
請問是示例代碼有問題嗎 還是我這個(gè)有問題，

onWorkerStart里面的定時(shí)器代碼

define('HEARTBEAT_TIME', 10);

Timer::add(2, function () use ($db, $ad_worker) {
        $time_now = time();
        foreach ($ad_worker->connections as $connection) {
            // 有可能該connection還沒收到過消息，則lastMessageTime設(shè)置為當(dāng)前時(shí)間
            if (empty($connection->lastMessageTime)) {
                print_r('empty:' . PHP_EOL);
                $connection->lastMessageTime = $time_now;
                continue;
            }
            // 上次通訊時(shí)間間隔大于心跳間隔，則認(rèn)為客戶端已經(jīng)下線，關(guān)閉連接
            if ($time_now - $connection->lastMessageTime > HEARTBEAT_TIME) {
                OffLine($db, $connection);
                print_r('offline:' . $connection->id . PHP_EOL);
                $connection->close();
            }
        }
    });

onMessage里面

 $connection->lastMessageTime = time();