按日期（键）和时间（值）对多维数组进行排序

问题描述 投票：0回答：2

假设有以下巨大数组（我故意没有删除其中的任何记录，以便您拥有大量数据，以防有人想要深入研究并帮助我找到问题的解决方案）：

$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
列对该数组进行排序，这样我最终会得到按日期分组并按播放时间排序的电影列表...

第一个任务是一个超级简单的台词...

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);

但这不起作用，因为由于某种原因 

array_column($program, 'time')
返回一个空数组。在手册中，明确指出该数组可以是多维数组或从中提取一列值的对象数组。因此它可以是多维，而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？

我的想法是多维数组不能是关联数组，所以为了暂时删除日期键，我将上面更改为：

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......

我正在努力以智能/优雅的方式做到这一点，并避免使用循环来遍历每个值，但我没有想法了。因此，我们将非常感谢任何帮助。短暂性脑缺血发作。

php sorting array-multisort
2个回答
0
投票

好的，我找到了！！！我需要迭代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，我认为它是尽可能优雅的！ 

array_multisort(array_map('strtotime', array_keys($program)), SORT_ASC, $program);

foreach ($program as &$day) {
    array_multisort(array_column($day, 'time'), SORT_ASC, $day);
}
0
投票

正如 Sharky 所说，使用 

ksort()
按日期排序，然后迭代数组并按时间值对每个日期的子数组进行排序。您不需要调用 
strtotime
，因为 
Y-m-d
和 
H:i
已经是“大端”格式，因此您可以可靠地将它们作为常规字符串进行排序。

代码：（演示）

ksort($program);
array_walk(
    $program,
    fn(&$row) => usort($row, fn($a, $b) => $a['time'] <=> $b['time'])
);
var_export($program);

虽然箭头函数语法返回其右侧生成的任何数据，但 

usort()
的 
true
返回值将被忽略。神奇的事情发生是因为 
$row
变量正在通过引用进行修改。

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