PHP中具有进程分叉的Rabbitmq队列

我有一个基于PHP标准类的简单队列工作程序。它使用RabbitMQ作为服务器。我有一个队列类用于初始化AMQP连接wirh RabbitMQ。使用以下代码，一切正常：

$queue = new Queue('myQueue');

 while($envelope = $queue->getEnvelope()) {
   $command = unserialize($envelope->getBody());

   if ($command instanceof QueueCommand) {
     try {
       if ($command->execute()) {
         $queue->ack($envelope->getDeliveryTag());
       }
     } catch (Exception $exc) {
       // an error occurred so do some processing to deal with it
     }
   }
 }

然而，我想分叉队列命令执行，但在这种情况下，队列会随着第一个命令一次又一次的执行而无休止。我无法确认RabbitMQ已通过$queue->ack（）接收消息；我的分叉版本（为了测试而简化为只有一个子版本）如下所示：

$queue = new Queue('myQueue');

while($envelope = $queue->getEnvelope()) {
  $command = unserialize($envelope->getBody());

  if ($command instanceof QueueCommand) {
    $pid = pcntl_fork();

    if ($pid) {
      //parent proces
      //wait for child
      pcntl_waitpid($pid, $status, WUNTRACED);

      if($status > 0) {
        // an error occurred so do some processing to deal with it
      } else {
        //remove Command from queue
        $queue->ack($envelope->getDeliveryTag());
      }
    } else {
      //child process
      try {
        if ($command->execute()) {
          exit(0);
        }
      } catch (Exception $exc) {
        exit(1);
      }
    }
  }
}

---

任何帮助都将不胜感激……

我终于解决了这个问题！我必须从子进程运行ack命令，它是这样工作的！ 这是正确的代码：

$queue = new Queue('myQueue');

while($envelope = $queue->getEnvelope()) {
  $command = unserialize($envelope->getBody());

  if ($command instanceof QueueCommand) {
    $pid = pcntl_fork();

    if ($pid) {
      //parent proces
      //wit for child
      pcntl_waitpid($pid, $status, WUNTRACED);

      if($status > 0) {
        // an error occurred so do some processing to deal with it
      } else {
        // sucess
      }
    } else {
      //child process
      try {
        if ($command->execute()) {
          $queue->ack($envelope->getDeliveryTag());
          exit(0);
        }
      } catch (Exception $exc) {
        exit(1);
      }
    }
  }
}