Laravel - 如何通过不同键的时间戳值对数组对象进行排序？

Question

我有这样的阵列从Laravel对象合并征收，这样的访问，$collection->values()->all()，它返回如下：

[ 
    { 
    "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" 
    } 
    } 
] 

我想排序的created_at领域的秩序，所以它看起来是这样的：

[ 
    { 
    "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是在两个地方，有时是created_at下和其他时候，它data.created_at下。

Answer 1

我想你可以使用sortByDesc功能：

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