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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 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']);


Any Ideas?

1 Answer

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by (52.8k points)

There are many ways to solve this issue that you are facing. The first thing you can go for a plugin:

Or You can code manually below is the link you can check-out:

Another way to solve this issue would be to add the following code in function.php:-

add_filter( 'query_vars', 'addnew_query_vars', 10, 1 );

function addnew_query_vars($vars)


$vars[]='var1';//var1 is the name of the variable you want to add 

return $vars; 


If you will use this code then you will be able to use $_GET['var1'] that you want to use in your code.