laravel框架查询数据集转为数组的两种方法

return DB::table('game_matchperiod')->select('starttime')->where('Type',$type)->get()
 ->map(function ($value) {return (array)$value;})->toArray();

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