From bc372e953794d8ec1f3eec3cb8d3a3217c596303 Mon Sep 17 00:00:00 2001
From: Pieter Frenssen <pieter@frenssen.be>
Date: Thu, 3 Jan 2013 22:13:26 +0100
Subject: [PATCH] Issue #1850798 by pfrenssen: Provide a recursive version of array_diff_assoc().

---
 core/includes/utility.inc |   36 ++++++++++++++++++++++++++++++++++++
 1 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/core/includes/utility.inc b/core/includes/utility.inc
index 5019852..6eb8f55 100644
--- a/core/includes/utility.inc
+++ b/core/includes/utility.inc
@@ -63,3 +63,39 @@ function drupal_var_export($var, $prefix = '') {
 
   return $output;
 }
+
+/**
+ * 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 array_diff_assoc_recursive(array $array1, array $array2) {
+  $difference = array();
+  foreach ($array1 as $key => $value) {
+    if (is_array($value)) {
+      if (!isset($array2[$key]) || !is_array($array2[$key])) {
+        $difference[$key] = $value;
+      }
+      else {
+        $new_diff = array_diff_assoc_recursive($value, $array2[$key]);
+        if (!empty($new_diff)) {
+          $difference[$key] = $new_diff;
+        }
+      }
+    }
+    elseif (!isset($array2[$key]) || $array2[$key] != $value) {
+      $difference[$key] = $value;
+    }
+  }
+  return $difference;
+}
-- 
1.7.4.1