在save之后，$data->id应该是最后插入的ID.

After save, $data->id should be the last id inserted.

return Response::json(array('success' => true, 'last_insert_id' => $data->id), 200);

有关更新的laravel版本，请尝试此

For updated laravel version try this

return response()->json(array('success' => true, 'last_insert_id' => $data->id), 200);