Merge branch '3.3' into 3.4

* 3.3:
  [DI] Remove unused props from the PhpDumper
  [VarDumper] Keep and reuse array stubs in memory
  [ProxyManager] Cleanup fixtures
  [Console][WebServerBundle] Use "exec" when possible
  [Debug] HTML-escape array key
  Add some phpdocs for IDE autocompletion and better SCA
  Fixed typo in docblock

Author: nicolas-grekas

Extension/Core/EventListener/ResizeFormListener.php

@@ -15,6 +15,7 @@
 use Symfony\Component\Form\FormEvent;
 use Symfony\Component\Form\Exception\UnexpectedTypeException;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Form\FormInterface;
 
 /**
  * Resize a collection form element based on the data sent from the client.
@@ -150,6 +151,7 @@ public function onSubmit(FormEvent $event)
 
         if ($entryFilter = $this->deleteEmpty) {
             $previousData = $form->getData();
+            /** @var FormInterface $child */
             foreach ($form as $name => $child) {
                 $isNew = !isset($previousData[$name]);
                 $isEmpty = is_callable($entryFilter) ? $entryFilter($child->getData()) : $child->isEmpty();

Extension/Core/Type/ChoiceType.php

@@ -116,6 +116,7 @@ public function buildForm(FormBuilderInterface $builder, array $options)
                 // Reconstruct the data as mapping from child names to values
                 $data = array();
 
+                /** @var FormInterface $child */
                 foreach ($form as $child) {
                     $value = $child->getConfig()->getOption('value');
 

Extension/Validator/Constraints/FormValidator.php

@@ -78,6 +78,7 @@ public function validate($form, Constraint $constraint)
         } else {
             $childrenSynchronized = true;
 
+            /** @var FormInterface $child */
             foreach ($form as $child) {
                 if (!$child->isSynchronized()) {
                     $childrenSynchronized = false;