php array diff recursive (from php.net site)

gistfile1.php

private function arrayRecursiveDiff($aArray1, $aArray2) {
        $aReturn = array();
      
        foreach ($aArray1 as $mKey => $mValue) {
          if (array_key_exists($mKey, $aArray2)) {
            if (is_array($mValue)) {
              $aRecursiveDiff = $this->arrayRecursiveDiff($mValue, $aArray2[$mKey]);
              if (count($aRecursiveDiff)) { $aReturn[$mKey] = $aRecursiveDiff; }
            } else {
              if ($mValue != $aArray2[$mKey]) {
                $aReturn[$mKey] = $mValue;
              }
            }
          } else {
            $aReturn[$mKey] = $mValue;
          }
        }
        return $aReturn;
      }