Documentation for debug:event-dispatcher command

Author: Matthieu Auger

cookbook/service_container/event_listener.rst

@@ -133,3 +133,20 @@ done as follow::
     Two types of request are available in the :class:`Symfony\\Component\\HttpKernel\\HttpKernelInterface`
     interface: ``HttpKernelInterface::MASTER_REQUEST`` and
     ``HttpKernelInterface::SUB_REQUEST``.
+
+Debugging event listeners
+-------------------------
+
+You can find out what listeners are registered in the event dispatcher
+using the console. To show all events and their listeners, run:
+
+.. code-block:: bash
+
+    $ php app/console debug:event-dispatcher
+
+You can get registered listeners about a particular event by specifying
+its name:
+
+.. code-block:: bash
+
+    $ php app/console debug:event-dispatcher kernel.exception