How to interrupt the processing of an interrupted AJAX request on the server (php)?

Question

PHP

Apache server, bang on.
I'm new, please don't throw stones.

How to interrupt the processing of an AJAX request on the server that was interrupted by the client.
On the client side, I interrupt like this:
ajax_request.abort();
On the server, I tried to interrupt in this way, but nothing comes out , because I don’t really understand the ins and outs of the process.

//Первый метод (не работает)
ignore_user_abort(false);
//Второй метод (не работает)
if(connection_aborted()){
  exit;
}

Answer 1

No way. abort cancels waiting for a response from the server, this does not affect the server itself in any way. It's like if you sent a letter and while it's coming, you decide to move to another apartment. The letter will still be read by the addressee.

Answer 2

The server will realize that the connection is broken only when it tries to send something to the client.
More details: www.php.su/phphttp/?connhandling

Answer 3

Watching, of course, what request and how much is executed.
For example, a pool of tasks is created on the server and a PoolWorker thread takes tasks from there and executes them in turn.
Something sent a task from the site, which was placed in the pool. Then something cancels this task.
We receive a cancellation request, check the pool, if there is, we delete the task, if not, then we look in the already running tasks (threads), if there is, we close the thread.
It is clear that this is all asynchronous, sometimes the task will have time to be executed. How to do it synchronously is not very clear.

Answer 4

Send another ajax request to abort the operation.
But here the question arises, which operation should be interrupted.