Laravel-如何按不同键的时间戳值对数组对象进行排序

Question

我有一个来自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字段对顺序进行排序，因此看起来像这样：

 [
  {
    "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"
  }
]

问题是created_at在两个位置，有时在created_at下，有时在data.created_at下。

Answer 1

我认为您可以使用sortByDesc函数：

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