1 files changed, 38 insertions, 0 deletions
diff --git a/includes/common.inc b/includes/common.inc
index 3ec68636c..9283766c2 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -6470,6 +6470,44 @@ function element_set_attributes(array &$element, array $map) {
 }
 
 /**
+ * Recursively computes the difference of arrays with additional index check.
+ *
+ * This is a version of array_diff_assoc() that supports multidimensional
+ * arrays.
+ *
+ * @param array $array1
+ *   The array to compare from.
+ * @param array $array2
+ *   The array to compare to.
+ *
+ * @return array
+ *   Returns an array containing all the values from array1 that are not present
+ *   in array2.
+ */
+function drupal_array_diff_assoc_recursive($array1, $array2) {
+  $difference = array();
+
+  foreach ($array1 as $key => $value) {
+    if (is_array($value)) {
+      if (!array_key_exists($key, $array2) || !is_array($array2[$key])) {
+        $difference[$key] = $value;
+      }
+      else {
+        $new_diff = drupal_array_diff_assoc_recursive($value, $array2[$key]);
+        if (!empty($new_diff)) {
+          $difference[$key] = $new_diff;
+        }
+      }
+    }
+    elseif (!array_key_exists($key, $array2) || $array2[$key] !== $value) {
+      $difference[$key] = $value;
+    }
+  }
+
+  return $difference;
+}
+
+/**
  * Sets a value in a nested array with variable depth.
  *
  * This helper function should be used when the depth of the array element you