foreach ($arrRet as $key => $cat) {
            if ($cat['parent_category_id']) {
                $categories[] = $cat;
                continue;
            } else {
                if ($parent_cat) {
                    $categories[] = $parent_cat;
                }
                $parent_cat = $cat;
            }

            if (!$key) {
                continue;
            } elseif (!$arrRet[$key+1]['category_id']) {
                $categories[] = $parent_cat;
            }
        }
        return $categories;