Differences in session variable declaration

@n2fole00,

I can't believe I missed this. The issue is your if condition. see... https://stackoverflow.com/questions/1374...s-0-in-php

I would do something like this...
$site_lang = ($_SESSION['site_lang'] === NULL)? FALSE : $_SESSION['site_lang']; or
$site_lang = (isset($_SESSION['site_lang']))? FALSE : $_SESSION['site_lang'];