Laravel - 如何按不同键的时间戳值对数组对象进行排序？

Question

我有这个来自 Laravel 合并集合的对象数组，像这样访问，$collection->values()->all()，它返回以下内容：

 [
  {
    "id": "1",
    "type": "Teacher",
    "created_at": "2017-05-11 18:00:00"
  },
  {
    "id": "2",
    "type": "Student"
    "created_at": "2017-05-11 15:00:00"
  },
  {
    "id": "3",
    "type": "Course",
    "data": {
       "title: "PHP",
       "created_at": "2017-05-11 16:00:00"
    }
  }
]

我正在尝试按created_at 字段对订单进行排序，所以它看起来像这样：

 [
  {
    "id": "1",
    "type": "Teacher",
    "created_at": "2017-05-11 18:00:00"
  },
  {
    "id": "3",
    "type": "Course",
    "data": {
       "title: "PHP",
       "created_at": "2017-05-11 16:00:00"
    }
  },
  {
    "id": "2",
    "type": "Student"
    "created_at": "2017-05-11 15:00:00"
  }
]

问题在于created_at 位于两个位置，有时位于created_at 下，有时位于data.created_at 下。

Answer 1

我认为你可以使用sortByDescfunction：

$sorted = $collection->sortByDesc(function ($element) {
    return $element->data ? $element->data->created_at : $element->created_at;
});