Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Component\Utility;
Chris@0: 
Chris@0: /**
Chris@0:  * Provides helpers to perform diffs on multi dimensional arrays.
Chris@0:  *
Chris@0:  * @ingroup utility
Chris@0:  */
Chris@0: class DiffArray {
Chris@0: 
Chris@0:   /**
Chris@0:    * Recursively computes the difference of arrays with additional index check.
Chris@0:    *
Chris@0:    * This is a version of array_diff_assoc() that supports multidimensional
Chris@0:    * arrays.
Chris@0:    *
Chris@0:    * @param array $array1
Chris@0:    *   The array to compare from.
Chris@0:    * @param array $array2
Chris@0:    *   The array to compare to.
Chris@0:    *
Chris@0:    * @return array
Chris@0:    *   Returns an array containing all the values from array1 that are not present
Chris@0:    *   in array2.
Chris@0:    */
Chris@0:   public static function diffAssocRecursive(array $array1, array $array2) {
Chris@0:     $difference = [];
Chris@0: 
Chris@0:     foreach ($array1 as $key => $value) {
Chris@0:       if (is_array($value)) {
Chris@0:         if (!array_key_exists($key, $array2) || !is_array($array2[$key])) {
Chris@0:           $difference[$key] = $value;
Chris@0:         }
Chris@0:         else {
Chris@0:           $new_diff = static::diffAssocRecursive($value, $array2[$key]);
Chris@0:           if (!empty($new_diff)) {
Chris@0:             $difference[$key] = $new_diff;
Chris@0:           }
Chris@0:         }
Chris@0:       }
Chris@0:       elseif (!array_key_exists($key, $array2) || $array2[$key] !== $value) {
Chris@0:         $difference[$key] = $value;
Chris@0:       }
Chris@0:     }
Chris@0: 
Chris@0:     return $difference;
Chris@0:   }
Chris@0: 
Chris@0: }