How to pass extra variables in URL with WordPress

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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 but it does not work if the url contains any more information 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']);

Any Ideas?


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

Or code manually, check out this post:

Also check out:

Source: stackoverflow