//require the Twig autoloader require_once 'path/to/lib/Twig/Autoloader.php'; //register the Twig autoloader Twig_Autoloader::register(); //create a new Twig environment $loader = new Twig_Loader_Array(array( 'template_name' => 'Hello {{ name }}!' )); $twig = new Twig_Environment($loader, array( 'cache' => '/path/to/compilation_cache', )); //render the template echo $twig->render('template_name', array('name' => 'World'));This example creates a Twig environment with an array loader and then renders a template named "template_name" with a variable "name" passed in as "World". Package library: Twig is an open-source package library that can be installed through Composer. Its package name is "twig/twig".