$languages = get_online_languages(); print_r($languages);
$language = $_GET['lang']; $languages = get_online_languages(); if (in_array($language, $languages)) { // display content in the selected language } else { // fallback to default language }The package library for the "get_online_languages" setting is the PHP core itself. It is a built-in function that does not require any external libraries or packages.