<?php if (in_array($_GET['lang'], ['en', 'fr', 'cz'])) { setcookie( "lang", $_GET['lang'], time() + 60 * 60 * 24 * 30, secure: true, httponly: true, ); $_COOKIE['lang'] = $_GET['lang']; } switch ($_COOKIE['lang']) { case 'en': require('assets/locale/en.php'); break; case 'cz': require('assets/locale/cz.php'); break; default: require('assets/locale/fr.php'); break; }