PHP - get updated cookie value

Question

I have a web page based on different PHP source file.

In one of these file, the code updates a cookie value: setcookie('serial_number', $serial, time()+3600, '/');

In another file I would like to use the updated cookie, $serialNew = $_COOKIE['serial_number']; but I see always the old value, the new is not available until the page refresh.

How can I get the updated value? There is some way to do this? Thanks

Answer 1

Thanks to all..

I resolved adding this: $_COOKIE['serial_number'] = $serial;

so the cookie is updated in every script