<?php namespace Wallabag\UserBundle\DependencyInjection; use Symfony\Component\Config\Definition\Builder\TreeBuilder; use Symfony\Component\Config\Definition\ConfigurationInterface; class Configuration implements ConfigurationInterface { public function getConfigTreeBuilder() { $treeBuilder = new TreeBuilder(); $rootNode = $treeBuilder->root('wallabag_user'); $rootNode ->children() ->booleanNode('registration_enabled') ->defaultValue(true) ->end() ->end() ; return $treeBuilder; } }