diff --git a/src/Symfony/Component/Form/Form.php b/src/Symfony/Component/Form/Form.php
index d8a6e38174b35..597964c7e7974 100644
--- a/src/Symfony/Component/Form/Form.php
+++ b/src/Symfony/Component/Form/Form.php
@@ -523,6 +523,8 @@ public function isSubmittedWithExtraFields()
      */
     public function isValid()
     {
+        $this->validate();
+
         if (!parent::isValid()) {
             return false;
         }
@@ -749,9 +751,7 @@ public function bind(Request $request, $data = null)
             $values = $request->request->get($this->getName(), array());
             $files = $request->files->get($this->getName(), array());
 
-            $this->submit(self::deepArrayUnion($values, $files));
-
-            $this->validate();
+            $this->submit(array_replace_recursive($values, $files));
         }
     }
 
@@ -940,25 +940,4 @@ public function isEmpty()
 
         return true;
     }
-
-    /**
-     * Merges two arrays without reindexing numeric keys.
-     *
-     * @param array $array1 An array to merge
-     * @param array $array2 An array to merge
-     *
-     * @return array The merged array
-     */
-    static protected function deepArrayUnion($array1, $array2)
-    {
-        foreach ($array2 as $key => $value) {
-            if (is_array($value) && isset($array1[$key]) && is_array($array1[$key])) {
-                $array1[$key] = self::deepArrayUnion($array1[$key], $value);
-            } else {
-                $array1[$key] = $value;
-            }
-        }
-
-        return $array1;
-    }
 }