生成或更新城市数据（省市区县）

/***
     * @return \think\response\Json
     * 更新城市json数据
     */
    public function makejsonareas(){
        set_time_limit(0);
        $pro = Db::table('up_area')
            ->where('level',1)
//            ->where('district_id',1001)
            ->field('district_id id,district name')
            ->select();
        $shi = Db::table('up_area')
            ->where('level',2)
            ->field('district_id id,district name,pid parentId')
            ->select();
        $qu = Db::table('up_area')
            ->where('level',3)
            ->field('district_id id,district name,pid parentId')
            ->select();
        $street = Db::table('up_area')
            ->where('level',4)
            ->field('district_id id,district name,pid parentId')
            ->select();
        foreach ($qu as $k=>$v){
            foreach ($street as $kk=>$vv){
                if($vv['parentId'] == $v['id']){
                    $qu[$k]['sub'][] = $vv;
                }
            }
        }
        foreach ($shi as $k=>$v){
            foreach ($qu as $kk=>$vv){
                if($vv['parentId'] == $v['id']){
                    $shi[$k]['sub'][] = $vv;
                }
            }
        }
        foreach($pro as $k=>$v){
            $pro[$k]['parentId'] = 0;
            foreach ($shi as $kk=>$vv){
                if($vv['parentId'] == $v['id']){
                    $pro[$k]['sub'][] = $vv;
                }
            }
        }
        $root = $_SERVER['DOCUMENT_ROOT'];
        $myfile = fopen("$root/static/test.json", "w") or die("Unable to open file!");
        $txt = json_encode($pro);
        fwrite($myfile, $txt);
        fclose($myfile);
        return json(['code' => 200, 'msg' => '更新成功']);
    }