/**
* 根据 category_id 获取该分类所有的父级数组（包括自己）
* @param $category_id int
* @return array
*/
public function get_parents_by_category_id($category_id)
{
$result = array();
$category = $this->get($category_id);
$categories = $this->load();
$result = tree::get_parents($categories, $category_id);
return $result;
}