New in Symfony 2.3: Events in the Console Component

Contributed by

Fabien Potencier

in #7466.

Today, I'm about to write about one of the oldest feature requests for the
Console component: the possibility to hook during the lifecycle of a command
execution. I have been delaying this feature for a long time as I did not want
to introduce a hard dependency between the Console component and the Event
Dispatcher component.

But as of Symfony 2.3, you can listen to several events that are dispatched by
the main console application:

1 2 3 4 5 6 7 8

use Symfony\Component\Console\Application; use Symfony\Component\EventDispatcher\EventDispatcher; $dispatcher = new EventDispatcher(); $application = new Application(); $application->setDispatcher($dispatcher); $application->run();

Note that events are only dispatched if you inject an event dispatcher.

Three events are automatically dispatched:

• ConsoleEvents::COMMAND lets you do something before a command is
  executed;


• ConsoleEvents::TERMINATE lets you perform some cleanup actions after the
  command has been executed;


• ConsoleEvents::EXCEPTION lets you handle exceptions thrown during the
  execution of a command.

If you want to see some code example, read the full documentation about this
new feature in the Console component documentation.

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