假设以下巨大数组（我故意没有删除它的任何记录，以便您拥有大量数据，以防有人想深入研究并帮助我找到解决我的问题的方法）问题）：
$program = array (
'2021-07-11' =>
array (
0 =>
array (
'movie' => 'Movie 1',
'channel' => 'Channel 10',
'time' => '23:00',
),
1 =>
array (
'movie' => 'Movie 2',
'channel' => 'Channel 2',
'time' => '01:15',
),
2 =>
array (
'movie' => 'Movie 8',
'channel' => 'Channel 4',
'time' => '11:00',
),
3 =>
array (
'movie' => 'Movie 12',
'channel' => 'Channel 11',
'time' => '17:30',
),
4 =>
array (
'movie' => 'Movie 14',
'channel' => 'Channel 5',
'time' => '21:00',
),
5 =>
array (
'movie' => 'Movie 15',
'channel' => 'Channel 5',
'time' => '02:20',
),
6 =>
array (
'movie' => 'Movie 17',
'channel' => 'Channel 11',
'time' => '17:30',
),
7 =>
array (
'movie' => 'Movie 19',
'channel' => 'Channel 5',
'time' => '10:00',
),
8 =>
array (
'movie' => 'Movie 21',
'channel' => 'Channel 8',
'time' => '1:20',
),
9 =>
array (
'movie' => 'Movie 33',
'channel' => 'Channel 5',
'time' => '00:20',
),
10 =>
array (
'movie' => 'Movie 39',
'channel' => 'Channel 3',
'time' => '17:30',
),
11 =>
array (
'movie' => 'Movie 40',
'channel' => 'Channel 3',
'time' => '22:00',
),
12 =>
array (
'movie' => 'Movie 41',
'channel' => 'Channel 5',
'time' => '14:00',
),
13 =>
array (
'movie' => 'Movie 42',
'channel' => 'Channel 5',
'time' => '23:00',
),
14 =>
array (
'movie' => 'Movie 43',
'channel' => 'Channel 2',
'time' => '14:15',
),
15 =>
array (
'movie' => 'Movie 44',
'channel' => 'Channel 2',
'time' => '18:00',
),
16 =>
array (
'movie' => 'Movie 45',
'channel' => 'Channel 2',
'time' => '23:45',
),
17 =>
array (
'movie' => 'Movie 46',
'channel' => 'Channel 1',
'time' => '22:00',
),
18 =>
array (
'movie' => 'Movie 47',
'channel' => 'Channel 6',
'time' => '21:10',
),
),
'2021-07-10' =>
array (
0 =>
array (
'movie' => 'Movie 3',
'channel' => 'Channel 2',
'time' => '14:15',
),
1 =>
array (
'movie' => 'Movie 5',
'channel' => 'Channel 3',
'time' => '22:00',
),
2 =>
array (
'movie' => 'Movie 6',
'channel' => 'Channel 11',
'time' => '23:00',
),
3 =>
array (
'movie' => 'Movie 7',
'channel' => 'Channel 4',
'time' => '11:15',
),
4 =>
array (
'movie' => 'Movie 11',
'channel' => 'Channel 4',
'time' => '21:00',
),
5 =>
array (
'movie' => 'Movie 16',
'channel' => 'Channel 2',
'time' => '23:45',
),
6 =>
array (
'movie' => 'Movie 20',
'channel' => 'Channel 4',
'time' => '23:00',
),
7 =>
array (
'movie' => 'Movie 23',
'channel' => 'Channel 5',
'time' => '01:00',
),
8 =>
array (
'movie' => 'Movie 27',
'channel' => 'Channel 4',
'time' => '01:00',
),
9 =>
array (
'movie' => 'Movie 29',
'channel' => 'Channel 7',
'time' => '02:15',
),
10 =>
array (
'movie' => 'Movie 31',
'channel' => 'Channel 5',
'time' => '14:00',
),
11 =>
array (
'movie' => 'Movie 32',
'channel' => 'Channel 5',
'time' => '22:10',
),
12 =>
array (
'movie' => 'Movie 36',
'channel' => 'Channel 2',
'time' => '00:01',
),
13 =>
array (
'movie' => 'Movie 37',
'channel' => 'Channel 2',
'time' => '11:30',
),
14 =>
array (
'movie' => 'Movie 38',
'channel' => 'Channel 6',
'time' => '22:30',
),
),
'2021-07-09' =>
array (
0 =>
array (
'movie' => 'Movie 4',
'channel' => 'Channel 5',
'time' => '21:00',
),
1 =>
array (
'movie' => 'Movie 9',
'channel' => 'Channel 11',
'time' => '22:00',
),
2 =>
array (
'movie' => 'Movie 10',
'channel' => 'Channel 9',
'time' => '16:45',
),
3 =>
array (
'movie' => 'Movie 18',
'channel' => 'Channel 7',
'time' => '22:00',
),
4 =>
array (
'movie' => 'Movie 22',
'channel' => 'Channel 5',
'time' => '23:00',
),
5 =>
array (
'movie' => 'Movie 24',
'channel' => 'Channel 9',
'time' => '21:00',
),
6 =>
array (
'movie' => 'Movie 25',
'channel' => 'Channel 9',
'time' => '23:00',
),
7 =>
array (
'movie' => 'Movie 26',
'channel' => 'Channel 4',
'time' => '21:00',
),
8 =>
array (
'movie' => 'Movie 28',
'channel' => 'Channel 8',
'time' => '23:00',
),
9 =>
array (
'movie' => 'Movie 30',
'channel' => 'Channel 6',
'time' => '23:45',
),
10 =>
array (
'movie' => 'Movie 34',
'channel' => 'Channel 3',
'time' => '23:00',
),
11 =>
array (
'movie' => 'Movie 35',
'channel' => 'Channel 2',
'time' => '22:00',
),
),
'2021-07-12' =>
array (
0 =>
array (
'movie' => 'Movie 13',
'channel' => 'Channel 5',
'time' => '01:20',
),
),
)
我想按日期（第一维的键）和第三维的time列对这个数组进行排序，这样我最终会得到一个按日期分组的电影列表，并排序按他们的播出时间...
第一个任务是一个超级简单的单线...
array_multisort(array_map('strtotime', array_keys($program)), SORT_ASC, $program);
然而，第二个任务让我很难以类似的优雅方式实现......我尝试的是：
array_multisort(array_map('strtotime', array_keys($program)), SORT_ASC, array_column($program, 'time'), SORT_ASC, $program);
但是由于某种原因这不起作用 array_column($program, 'time') 返回一个空数组。在 manual 中明确指出数组可以是一个多维数组或一个对象数组，从中提取一列值。所以它可以是一个 多维，不是严格的二维数组...为什么它在我的情况下不起作用？我错过了什么？
我以为多维数组不能是关联数组，所以为了暂时去掉日期键，我把上面的改成：
array_multisort(array_map('strtotime', array_keys($program)), SORT_ASC, array_column(array_values($program), 'time'), SORT_ASC, $program);
但不幸的是这也不起作用......
我正在努力以一种聪明/优雅的方式做到这一点，并避免使用循环来遍历每个值，但我的想法已经用完了。所以任何帮助将不胜感激。 TIA。
答案 0 :(得分：0)
好的，我找到了！！！我需要遍历初始数组的每个子数组（通过引用），并在其中执行 array_multisort ......所以下面的代码做到了这一点，我想它尽可能优雅！ !!
array_multisort(array_map('strtotime', array_keys($program)), SORT_ASC, $program);
foreach ($program as &$day) {
array_multisort(array_column($day, 'time'), SORT_ASC, $day);
}