twig implementation

vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/README.md

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+EventDispatcher Component
+=========================
+
+EventDispatcher implements a lightweight version of the Observer design
+pattern.
+
+    use Symfony\Component\EventDispatcher\EventDispatcher;
+    use Symfony\Component\EventDispatcher\Event;
+
+    $dispatcher = new EventDispatcher();
+
+    $dispatcher->addListener('event_name', function (Event $event) {
+        // ...
+    });
+
+    $dispatcher->dispatch('event_name');
+
+Resources
+---------
+
+You can run the unit tests with the following command:
+
+    $ cd path/to/Symfony/Component/EventDispatcher/
+    $ composer.phar install --dev
+    $ phpunit