您需要使用原始表达式所以你可以使用这样的特殊功能。

You need to use raw expressions so you can use special functions like that.

Model::select(DB::raw('substr(id, 1, 4) as id'))->groupBy(DB::raw('substr(id, 1, 4)'))->get();

其中模型是您想要的雄辩模型运行查询。

Where Model is your Eloquent model you want to run the query on.