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