How to get this value made by javascript in a PHP-var? [duplicate]

I have this code

<?php $test = 16010; ?>
<button "onclick="myFunction('<?php echo $test; ?>')" data-toggle="modal" data-target="#myModal">Edit</button>
<script>
function myFunction(number) {  document.getElementById("result").innerHTML = number;</script>

<p id='result'></p>

This code will show the result: 16010, but I don't know how to put that value in a php var. Please help!

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