example.php

<?php
// Template HTML (index.html)

<p>Welcome {{ name }}!</p>

// Rendering

require_once '/path/to/composer/autoloader.php';
Twig_Autoloader::register();

$loader = new Twig_Loader_Filesystem('/path/to/templates');
$twig = new Twig_Environment($loader, array(
    'cache' => '/path/to/cachefolder',
));

echo $twig->render('index.html', array('name' => 'Stormix'));