[ticket/13266] Enable the debug extension in the development environment

PHPBB3-13266

phpBB/config/default/container/services_twig.yml

@@ -41,3 +41,6 @@ services:
             - @router
         tags:
             - { name: twig.extension }
+
+    template.twig.extensions.debug:
+        class: Twig_Extension_Debug

phpBB/config/development/config.yml

@@ -3,3 +3,6 @@ imports:
 
 core:
     require_dev_dependencies: true
+
+    twig:
+        enable_debug_extension: true

phpBB/phpbb/di/extension/container_configuration.php

@@ -30,7 +30,13 @@ class container_configuration implements ConfigurationInterface
 		$rootNode = $treeBuilder->root('core');
 		$rootNode
 			->children()
-			->booleanNode('require_dev_dependencies')->defaultValue(false)->end()
+				->booleanNode('require_dev_dependencies')->defaultValue(false)->end()
+				->arrayNode('twig')
+					->addDefaultsIfNotSet()
+					->children()
+						->booleanNode('enable_debug_extension')->defaultValue(false)->end()
+					->end()
+				->end()
 			->end()
 		;
 		return $treeBuilder;

phpBB/phpbb/di/extension/core.php

@@ -67,6 +67,12 @@ class core extends Extension
 				);
 			}
 		}
+
+		if ($config['twig']['enable_debug_extension'])
+		{
+			$definition = $container->getDefinition('template.twig.extensions.debug');
+			$definition->addTag('twig.extension');
+		}
 	}
 
 	/**