php无线分类按子分类排序

 //把所有栏目id返回
    //$cateRes为$cateRes = db('StoreClass')->where('store_id',$uid)->order('class_sort desc')->select();
    public function catetree($cateRes){
        return $this->sort($cateRes);
    }
    public function sort($cateRes,$pid=0,$level=0){
        static $arr=array();
        foreach ($cateRes as $k => $v) {
            if($v['class_pid']==$pid){
                $v['level']=$level;
                $arr[]=$v;
                $this->sort($cateRes,$v['class_id'],$level+1);
            }
        }
        return $arr;
    }

    //获取子栏目的id
    //$cateid为要查询的id
    public function childrenids($cateid){
        $data =db('StoreClass')->field('class_id,class_pid')->select();
        return $this->_childrenids($data,$cateid);
    }
    private function _childrenids($data,$cateid){
        static $arr = array();
        foreach ($data as $k => $v) {
            if($v['class_pid']==$cateid){
                $arr[] = $v['class_id'];
                $this->_childrenids($data,$v['class_id']);
            }
        }
        return $arr;
    }