How to execute a function after clicking a button

How do I execute a function after I click a button?
The code is as follows:

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If you want to click the "Send Notification" button again, execute a PHP function (about the PHP socket).

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With Ajax, jquery Ajax is easy to use.
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It can only trigger the foreground event, PHP in the background, so you want to make the server execute the file by request.
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With Ajax.

or submit a form directly,

or submit the form to the IFRAME processing.
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discuss

Reference:


It can only trigger the foreground event, PHP in the background, so you want to make the server execute the file by request.

I mostly want to use a PHP socket, so I want to execute PHP functions. Can you implement sockets with Ajax?

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