laravel中查询数据结果集变为数组

$nodes = Db::table('system_node')->orderBy('sort', 'asc')->orderBy('id' ,'asc')->get()->map(function ($value) {
            return (array)$value;
        })->toArray()

function objectToArray($object) {
    //先编码成json字符串，再解码成数组
    return json_decode(json_encode($object), true);
}