$lang = get_lang(); if($lang == 'en'){ echo "Welcome to our website!"; } elseif($lang == 'fr'){ echo "Bienvenue sur notre site web!"; }In this example, the function get_lang is called to retrieve the current language setting. Based on the result, the appropriate greeting is displayed in either English or French. It is difficult to determine the package library for this function, as it is a built-in function in PHP and does not require a separate library to be included.