PHP, using Alibaba Cloud's voice service, how to solve the error when obtaining the receipt message?

Question

Use Alibaba Cloud's voice service to obtain a receipt message. When there is a message in the queue of Alibaba Cloud, no error is reported. When the queue is empty, an error seems to be reported. The problem is not sure, so I would like to ask if there is a way to determine whether there is a message in the queue. News, please give advice from all the great gods.

捂耳听风。 · Answer

All the great gods are asking for answers.

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