gistfile1.php

	public function saveSitemap($tree, $parent_id = null, $sort = 0) {
		$this->begin(); 
		foreach($tree as $element) {
			if(isset($element['children'])) {
				$this->saveSitemap($element['children'], $element['id'], $sort);
			}
			// Save parent_id and sort
			if (!$this->updateField($element['id'], 'parent_id', $parent_id)
			||  !$this->updateField($element['id'], 'sort', ++$sort)
			||  !$this->updatePageUrls()) {
				$this->rollback();
				return false;
			} else {
			}
		}
		$this->commit();
		return true;
	}