按PHP中的值对多维关联数组进行排序

Question

我有这组数组：

Array(
    [day_1] => Array(
        [3744] => Array(
            [time_start] => 11:00
            [time_end] => 12:00
            [notes] => 
        )
        [3746] => Array(
            [time_start] => 08:00
            [time_end] => 11:00
            [notes] => 
        )
        [532] => Array(
            [time_start] => 09:00
            [time_end] => 11:30
            [notes] => 
        )
    )
    [day_2] => Array(
        [3747] => Array(
            [time_start] => 08:00
            [time_end] => 10:00
            [notes] => 
        )
    )
)

如何根据“time_start”的值对“day_1”中的数组进行排序？

我想要达到的最终结果是：

Array(
    [day_1] => Array(
        [3746] => Array(
            [time_start] => 08:00
            [time_end] => 11:00
            [notes] => 
        )
        [532] => Array(
            [time_start] => 09:00
            [time_end] => 11:30
            [notes] => 
        )
        [3744] => Array(
            [time_start] => 11:00
            [time_end] => 12:00
            [notes] => 
        )
    )
    [day_2] => Array(
        [3747] => Array(
            [time_start] => 08:00
            [time_end] => 10:00
            [notes] => 
        )
    )
)

我试过了：

foreach($array['day_1'] as $key => $value){
    $starttime[$key] = strtotime($value['time_start']);
}
array_multisort($starttime, SORT_ASC, $array['day_1']);

但它没有排序，它也删除了我的数组键。

Answer 1

使用uasort函数的解决方案：

// $arr is your initial array
uasort($arr['day_1'], function($a, $b){
    return strcmp($a['time_start'], $b['time_start']);
});

print_r($arr);

Demo link