取三级分销上下级用户id

//取上三级的用户id
public  function _get_up_third_id($member_id){
    $up_id=array();
    $invite_id=dbselect('invite_id')->from('{dt_user}')->where(['id'=>$member_id])->get(0,'invite_id');
    if($invite_id>0){
        //取上一级id
        $up_first=dbselect('id,invite_id')->from('{dt_user}')->where(['id'=>$invite_id])->get(0);
        if($up_first)
        {
            $up_id['up_first']=$up_first['id'];
            if($up_first['invite_id']>0)
            {
                //取上二级id
                $up_two=dbselect('id,invite_id')->from('{dt_user}')->where(['id'=>$up_first['invite_id']])->get(0);

                if($up_two)
                {
                    $up_id['up_two']=$up_two['id'];
                    if($up_two['invite_id']>0)
                    {

                            $up_id['up_third']=$up_two['invite_id'];

                    }

                }
            }

        }
    }

    return $up_id;

}

//取下三路id
public  function  _get_down_third_id($member_id){
    $down_third_info=array();
    //一级id
    $down_first=$this->_get_son_id([$member_id]);
    if($down_first)
    {
        $ids_first=[];
        $ids_two=[];
        //循环取出一级id中对应下级
        $down_third_info['down_first']=$down_first;
        //将数组中的id取出，然后根据拼装的数组取下一级的id
        foreach ($down_first as $key)
        {
            array_push($ids_first,$key['id']);
        }
        //二级id
        $down_two=$this->_get_son_id($ids_first);
        if($down_two){
            $down_third_info['down_two']=$down_two;
            foreach($down_two as $row){
                array_push($ids_two,$row['id']);
            }
            //三级id
            $down_third=$this->_get_son_id($ids_two);
            if($down_third){
                $down_third_info['down_third']=$down_third;
            }
        }

    }

    return $down_third_info;
}
//根据父级id取子级id
private  function  _get_son_id($ids=[]){
    $list=dbselect('id,invite_id')->from('{dt_user}')->where(['invite_id IN'=>$ids])->toArray();
    if($list)
    {
        return $list;
    }
    else
    {
        return array();
    }

}