Added check for array fields to be integers in reverseTransform metho…

…d. This prevents checkdate from getting strings as arguments and throwing incorrect ErrorException when submitting form with malformed (string) data in, for example, Date field. #2609

src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToArrayTransformer.php

@@ -142,6 +142,10 @@ public function reverseTransform($value)
             ));
         }
 
+        if (preg_match( '/^\d*$/', $value['month'] . $value['day'] . $value['year']) === 0) {
+            throw new TransformationFailedException('This is an invalid date');
+        }
+
         if (!empty($value['month']) && !empty($value['day']) && !empty($value['year']) && false === checkdate($value['month'], $value['day'], $value['year'])) {
             throw new TransformationFailedException('This is an invalid date');
         }