/**
     * 查询所有数据  并且缓存
     * */
    public  function authData(){
        $res = $this->order(‘listorder asc‘)->select();
        // 格式化
        foreach($res as $k=>$v){
            $result[$v[‘id‘]] = $v;
        }
        Cache::set(‘auth‘,$result);
        return $result;
    }
/**
     * 子类数组
     * */
    public function pidTree($pid=0){
        $result = ‘‘;
        $arr = $this->authData();
        if(empty($arr)) return false;
        foreach($arr as $k=>$v){
            if($v[‘pid‘] ==$pid){
                $result[$v[‘id‘]] = $v;
            }
        }
        return $result;
    }

/**
     * 无限分类 树形结构
     * */
    public function getTree($pid=0){
        $arr = $this->pidTree($pid);
        if(empty($arr)) return false;
        foreach($arr as $k=>$v){
            $result[$v[‘id‘]] = $v;
            $result[$v[‘id‘]][‘son‘] = $this->getTree($v[‘id‘]);

        }
        return $result;

    }