How to pass extra variables in URL with WordPress

I am having trouble trying to pass an extra variable in the url to my WordPress installation.

For example /news?c=123

For some reason, it works only on the website root www.example.com?c=123 but it does not work if the url contains any more information www.example.com/news?c=123. I have the following code in my functions.php file in the theme directory.

if (isset($_GET['c'])) 
{
  setcookie("cCookie", $_GET['c']); 
}

if (isset($_SERVER['HTTP_REFERER']))
{
  setcookie("rCookie", $_SERVER['HTTP_REFERER']);
}

JavaScript
​x
 
if (isset($_GET['c'])) {  setcookie("cCookie", $_GET['c']); }​if (isset($_SERVER['HTTP_REFERER'])){  setcookie("rCookie", $_SERVER['HTTP_REFERER']);}​

Any Ideas?

Answer

There are quite few solutions to tackle this issue. First you can go for a plugin if you want:

WordPress Quickie: Custom Query String Plugin

Or code manually, check out this post:

Passing Query String Parameters in WordPress URL

Also check out:

add_query_arg

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Answer