How to get JavaScript variable value in PHP

I want the value of JavaScript variable which i could access using PHP. I am using the code below but it doesn’t return value of that variable in PHP.

// set global variable in javascript
    profile_viewer_uid = 1;

JavaScript
​x
 
// set global variable in javascript    profile_viewer_uid = 1;​

// php code

$profile_viewer_uid=$_POST['profile_viewer_uid'];

JavaScript
 
// php code​$profile_viewer_uid=$_POST['profile_viewer_uid']; ​

this gives me the following error :-

A PHP Error was encountered
Severity: Notice
Message: Undefined index: profile_viewer_uid

JavaScript
 
A PHP Error was encounteredSeverity: NoticeMessage: Undefined index: profile_viewer_uid​

Another php code i used which give empty value

$profile_viewer_uid = "<script language=javascript>document.write(profile_viewer_uid);</script>

JavaScript
 
$profile_viewer_uid = "<script language=javascript>document.write(profile_viewer_uid);</script>​

When I echo it shows nothing.

Answer

You will need to use JS to send the URL back with a variable in it such as: http://www.site.com/index.php?uid=1

by using something like this in JS:

window.location.href=”index.php?uid=1";

JavaScript
 
window.location.href=”index.php?uid=1";​

Then in the PHP code use $_GET:

$somevar = $_GET["uid"]; //puts the uid varialbe into $somevar

JavaScript
 
$somevar = $_GET["uid"]; //puts the uid varialbe into $somevar​

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Answer