Pointing your browser to the root directory of your Symfony project will bring you to the module default of the first app you created for the project. The following is the content of the file web/index.php in your Symfony’s project folder; 

<?php


require_once(dirname(__FILE__).'/../config/ProjectConfiguration.class.php');

$configuration = ProjectConfiguration::getApplicationConfiguration('admin', 'prod', false);
sfContext::createInstance($configuration)->dispatch();

In the example, the default app is admin. To make it load the app frontend for example, just replace admin in the file with frontend, and you’re all set.