Regular Expression - How to collect data under AJAX using PHP

How to collect AJAX data from a web page?
For example, some web pages require clicking a button before the data will appear (using AJAX technology).
How should I collect this data?

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How to collect AJAX data from a web page?
For example, some web pages require clicking a button before the data will appear (using AJAX technology).
How should I collect this data?

F12 network panel, see what ajax sends to the server,The key point is to include the http header, you can just send it as well.

Use curl