在AJAX中使用内联PHP [重复]

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                        <a href="/questions/13840429/what-is-the-difference-between-client-side-and-server-side-programming" dir="ltr">What is the difference between client-side and server-side programming?</a>
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            <div class="grid--cell mb0 mt8">Closed <span title="2017-06-27 13:25:06Z" class="relativetime">2 years ago</span>.</div>
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I need to call a couple small PHP functions that should execute after the user makes changes in the DOM. I know this can be done by capturing the change in jquery, then pointing an ajax call to a separate script with the function inside it; but having a few of these small functions I would rather not make a file for each, if possible. As such, is there a way to include the PHP code directly within the ajax call and not go to a separate url?

EDIT 1

Assuming a post request is being made, something like the following is what I'd like to do:

$("select").change(function() {
    $.post("<?php ... ?>", {option: $(this).val()}, function(return) {
        //do stuff with results
    }
});

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