$countrycode = (empty($_GET['id'])) ? "en" : strtolower(trim($_GET['id'])); $possible_codes = array('de', 'us', 'es', 'fr', 'it', 'br', 'ru', 'kr', 'tw', 'cn', 'jp'); if(array_search($countrycode, $possible_codes) === false) { $countrycode = "us"; } ?>