我使用的是laravel，想根据['messages']"update_at "字段对这个数组进行排序。该数组应该在顶部显示最新的消息。array_multisort( array_column($yourArray, "price"), SORT_ASC, $yourArray ) 但没有成功。
这是我的多维数组，我想按日期排序。
Array
(
[current_page] => 1
[data] => Array
(
[0] => Array
(
[id] => 236
[user] => Array
(
[id] => 91
[email] => [email protected]
[updated_at] => 2020-04-29 09:28:26
)
[messages] => Array
(
)
)
[1] => Array
(
[id] => 235
[description] => demo3
[user] => Array
(
[id] => 91
[email] => [email protected]
[updated_at] => 2020-04-29 09:28:26
)
[messages] => Array
(
[0] => Array
(
[id] => 95
[message] => Pickup message test
[user_id] => 35
[created_at] => 2020-04-28 12:28:18
[updated_at] => 2020-04-28 12:28:18
)
)
)
[2] => Array
(
[id] => 215
[description] => Testing for messages
[user] => Array
(
[id] => 35
[email] => [email protected]
[updated_at] => 2020-01-26 17:34:35
)
[messages] => Array
(
[0] => Array
(
[id] => 88
[message] => Testing for the message if not sent by business first.
[user_id] => 35
[created_at] => 2020-04-28 12:15:14
[updated_at] => 2020-04-28 12:15:14
)
[1] => Array
(
[id] => 90
[message] => Looks good.
[user_id] => 69
[created_at] => 2020-04-28 12:15:45
[updated_at] => 2020-04-28 12:15:45
)
)
)
)
)
我怎样才能实现这个目标?
使用usort函数 https:/www.php.netmanualenfunction.usort.php
写一个回调，比较嵌套的create_at属性。
如果你有一个laravel集合，你也可以使用
$collection = $collection->sort(function ($a, $b) {
if ($a == $b) {
return 0;
}
return ($a < $b) ? -1 : 1;
});
或者如果你使用的是雄辩，你可以从SQL中订购。
Message::where(...)->orderBy('created_at', 'DESC')->paginate(20)
从用户关系看
$user->with(['messages' => function ($query) {
$query->orderBy('created_at', 'DESC');
}]);