cs: Switch to a stricter way of coding - this might break in a lot of places.

src/Bundle/ChillMainBundle/Entity/User.php

@@ -7,6 +7,15 @@
  * the LICENSE file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
+/**
+ * Chill is a software for social workers.
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
 namespace Chill\MainBundle\Entity;
 
 use Doctrine\Common\Collections\ArrayCollection;
@@ -337,7 +346,7 @@ class User implements AdvancedUserInterface
         $groupCentersIds = [];
 
         foreach ($this->getGroupCenters() as $groupCenter) {
-            if (in_array($groupCenter->getId(), $groupCentersIds)) {
+            if (in_array($groupCenter->getId(), $groupCentersIds, true)) {
                 $context->buildViolation('The user has already those permissions')
                     ->addViolation();
             } else {