php处理相册问题

$restautants = Restaurant::where("id",$id)->update($inputs);
        $db_restaurant_albums = [];
        foreach (RestaurantAlbum::where("restaurant_id", $id)->get("img_url")->toArray() as $key => $v) {
            $db_restaurant_albums[] = $v['img_url'];
        }
        $params_restaurant_albums = $request->input()['restaurant_album'];
        //求并集
        $restaurant_merge = array_merge($db_restaurant_albums, $params_restaurant_albums);
        //对数据库内容和并集求差集添加入库并且删除数据库中剩下的图片以及目录中对应的图片
        //添加
        $db_restaurant_diff = array_values(array_diff($restaurant_merge, $db_restaurant_albums));
        $param_restaurant_diff = array_values(array_diff($restaurant_merge, $params_restaurant_albums));
        foreach ($db_restaurant_diff as $key => $v) {
            $albums['restaurant_id'] = $id;
            $albums['img_url'] = $db_restaurant_diff[$key];
            RestaurantAlbum::where('restaurant_id', $id)->create($albums);
        }
        //删除数据库脏数据删除目录脏图片
        foreach ($param_restaurant_diff as $key => $v) {
            RestaurantAlbum::where(["restaurant_id" => $id, "img_url" => $param_restaurant_diff['$key']])->delete();
        }