WeChat Development Reply What does success mean?

This is what the WeChat development documentation says

But what does this mean? How to reply to success? How to reply with empty string?

I searched everything on the Internet, but they only excerpted this paragraph and did not explain how to operate it.
Could you please write some code? I really don’t know what this means. Thanks.

Reply content:

This is what the WeChat development documentation says

But what does this mean? How to reply to success? How to reply with empty string?

I searched everything on the Internet, but they only excerpted this paragraph and did not explain how to operate it.
Could you please write some code? I really don’t know what this means. Thanks.

If you push normally, your return code should be an xml containing the content of your reply.
When you don’t want to reply to the message or cannot respond within 5 seconds, you should directly reply with a success or an empty string.
Note that success here means only outputting this thing, which is equivalent to echo ‘success’; it is not an xml with the reply content being success