get variable jquery in php variable

Question

I want to recover selectedValue variable javascript in $aaa variable php ?

$aaa = "<script>selectedVal</script>";
$(document).ready(function() {
  $('#example').DataTable({
    "lengthMenu": [
      [10, 25, 50, -1],
      [10, 25, 50, "All"]
    ]
  });
  $(document).on("change", ".dataTables_length select", function() {
    var selectedVal = $(this).val();
  });
});

Possible duplicate of [How to pass JavaScript variables to PHP?](https://stackoverflow.com/questions/1917576/how-to-pass-javascript-variables-to-php) — callback, Jun 07 '18 at 01:08
Use JSON to communicate between backend and frontend. The embedded php code inside the javascript is awful, it will be super hard maintenance job in the future. — caoglish, Jun 07 '18 at 01:17

score 0 · Accepted Answer · answered Jun 07 '18 at 01:12

If I understand this question correctly, you are asking to grab a javascript variable from the PHP code. Javascript is executed on the client side, PHP on the server side. This means that the PHP portion is finished executing before it's even sent to the user's web browser. This make the PHP code unable to "see" javascript variable.

If you want, in the other case, to set a javascript variable based on a PHP one, a simple solution would be:

<script type="text/javascript">
        var selectedVar = "<?php echo $aaa; ?>";
        ...

That will be seen from the user as:

<script type="text/javascript">
        var selectedVar = [$aaa variable content];
        ...

I hope this was helpful!

the need if the reverse javascript to php but apparently it is imppossible — Moslah, Jun 07 '18 at 10:35

get variable jquery in php variable

1 Answers1