converting js variable to php [duplicate]

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Closed 14 years ago.

Possible Duplicate:
javascript variable into php

Okay lets imagine I've a javascript variable "x"

<script>
var x="jsvar";
</script>

Now I want its value in php variable $y <?php $y; ?> How to do it.

Okay few people are confused i wanted to know is it possible if yes then how ?? if this isn't possible then comment here i'll remove it.

• zzzzBov: in PHP how? are you passing it to PHP?
• Landon: That variable exists in the browser, a php variable exists on the server, two very separate places. can you please elaborate on what your use is and we can suggest a method? The first thing that comes to mind is to submit a form that sends that value to the server, but, again, it depends on what you want
• Melsi: your options are ajax, POST, GET, href which one you want
• Mārtiņš Briedis: Someone needs to understand, that when javascript ir executed, the server has done it's job - there is no way to get back to it [PHP] in the current request. You have to make another request, perhaps, via ajax.
• Mohit Bumb: @Briedis Thanks got my answer.

Answer 1

You have to pass it to your PHP script, either via AJAX or via a formular with a submit button.

var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function(){}; // change
xhr.open("POST", "your-script.php");
xhr.send("x="+x);

And the PHP script can look like this:

<?php
$y = isset($_POST['x']) ? $_POST['x'] : '';
echo $y;
?>

• Mohit Bumb: is it possible with simple javascript or not ??
• ComFreek: Yes! Look at the first code - this is (simple) JavaScript.
• Mohit Bumb: ok can i ask one more question sorry i'm php developer but really bad in js what XMLHttpRequest(); can do ???
• ComFreek: You can send requests to other scripts and servers with that object. This is also called AJAX (Asynchronous JavaScript And XML). Here are probably more information: developer.mozilla.org/En/XMLHttpRequest/Using_XMLHttpRequest
• Mohit Bumb: okay thanks dude my mind is too much clear than before now with js thanks for help thumbs up