Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/lib/Drupal/Component/Utility/DiffArray.php

@@ -0,0 +1,55 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Utility\DiffArray.
+ */
+
+namespace Drupal\Component\Utility;
+
+/**
+ * Provides helpers to perform diffs on multi dimensional arrays.
+ *
+ * @ingroup utility
+ */
+class DiffArray {
+
+  /**
+   * 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.
+   */
+  public static function diffAssocRecursive(array $array1, array $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 {
+          $new_diff = static::diffAssocRecursive($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;
+  }
+
+}