Merge branch '2.8' into 3.4

* 2.8: [#10308] add use statement and fix array Encourage use of constants delete var_dump() functions in examples

Author: javiereguiluz

components/event_dispatcher/generic_event.rst

@@ -76,8 +76,6 @@ access the event arguments::
  );
  $dispatcher->dispatch('foo', $event);
 
- var_dump($event['counter']);
-
  class FooListener
  {
  public function handler(GenericEvent $event)
@@ -97,8 +95,6 @@ Filtering data::
  $event = new GenericEvent($subject, array('data' => 'Foo'));
  $dispatcher->dispatch('foo', $event);
 
- var_dump($event['data']);
-
  class FooListener
  {
  public function filter(GenericEvent $event)

doctrine/event_listeners_subscribers.rst

@@ -143,15 +143,16 @@ interface and have an event method for each event it subscribes to::
  use Doctrine\Common\EventSubscriber;
  // for Doctrine < 2.4: use Doctrine\ORM\Event\LifecycleEventArgs;
  use Doctrine\Common\Persistence\Event\LifecycleEventArgs;
+ use Doctrine\ORM\Events;
  use AppBundle\Entity\Product;
 
  class SearchIndexerSubscriber implements EventSubscriber
  {
  public function getSubscribedEvents()
  {
  return array(
- 'postPersist',
- 'postUpdate',
+ Events::postPersist,
+ Events::postUpdate,
  );
  }