重新排序PHP数组

Question

我有这个包含数据的数组。我目前正在提供的foreach循环中显示它，但我想重新排序（从MAX id到MIN id）

[0] => Array (
    [id] => 1
    [timestamp_start_ex] => Wed Mar  9 18:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 19:28:14 2016
    [timestamp_start] => 1457544494
    [timestamp_end] => 1457548094
    [orders] => 1
    )
[1] => Array (
    [id] => 2
    [timestamp_start_ex] => Wed Mar  9 17:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 18:28:14 2016
    [timestamp_start] => 1457540894
    [timestamp_end] => 1457544494
    [orders] => 0
    )
[2] => Array (
    [id] => 3
    [timestamp_start_ex] => Wed Mar  9 16:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 17:28:14 2016
    [timestamp_start] => 1457537294
    [timestamp_end] => 1457540894
    [orders] => 0
    )
[3] => Array (
    [id] => 4
    [timestamp_start_ex] => Wed Mar  9 15:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 16:28:14 2016
    [timestamp_start] => 1457533694
    [timestamp_end] => 1457537294
    [orders] => 0
    )
[4] => Array (
    [id] => 5
    [timestamp_start_ex] => Wed Mar  9 14:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 15:28:14 2016
    [timestamp_start] => 1457530094
    [timestamp_end] => 1457533694
    [orders] => 0
    )
[5] => Array (
    [id] => 6
    [timestamp_start_ex] => Wed Mar  9 13:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 14:28:14 2016
    [timestamp_start] => 1457526494
    [timestamp_end] => 1457530094
    [orders] => 0
    )
[6] => Array (
    [id] => 7
    [timestamp_start_ex] => Wed Mar  9 12:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 13:28:14 2016
    [timestamp_start] => 1457522894
    [timestamp_end] => 1457526494
    [orders] => 0
    )
[7] => Array (
    [id] => 8
    [timestamp_start_ex] => Wed Mar  9 11:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 12:28:14 2016
    [timestamp_start] => 1457519294
    [timestamp_end] => 1457522894
    [orders] => 0
    )
[8] => Array (
    [id] => 9
    [timestamp_start_ex] => Wed Mar  9 10:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 11:28:14 2016
    [timestamp_start] => 1457515694
    [timestamp_end] => 1457519294
    [orders] => 0
    )
[9] => Array (
    [id] => 10
    [timestamp_start_ex] => Wed Mar  9 09:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 10:28:14 2016
    [timestamp_start] => 1457512094
    [timestamp_end] => 1457515694
    [orders] => 0
    )
[10] => Array (
    [id] => 11
    [timestamp_start_ex] => Wed Mar  9 08:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 09:28:14 2016
    [timestamp_start] => 1457508494
    [timestamp_end] => 1457512094
    [orders] => 0
    )
[11] => Array (
    [id] => 12
    [timestamp_start_ex] => Wed Mar  9 07:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 08:28:14 2016
    [timestamp_start] => 1457504894
    [timestamp_end] => 1457508494
    [orders] => 0
    )
[12] => Array (
    [id] => 13
    [timestamp_start_ex] => Wed Mar  9 06:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 07:28:14 2016
    [timestamp_start] => 1457501294
    [timestamp_end] => 1457504894
    [orders] => 0
    )
[13] => Array (
    [id] => 14
    [timestamp_start_ex] => Wed Mar  9 05:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 06:28:14 2016
    [timestamp_start] => 1457497694
    [timestamp_end] => 1457501294
    [orders] => 0
    )
[14] => Array (
    [id] => 15
    [timestamp_start_ex] => Wed Mar  9 04:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 05:28:14 2016
    [timestamp_start] => 1457494094
    [timestamp_end] => 1457497694
    [orders] => 0
    )
[15] => Array (
    [id] => 16
    [timestamp_start_ex] => Wed Mar  9 03:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 04:28:14 2016
    [timestamp_start] => 1457490494
    [timestamp_end] => 1457494094
    [orders] => 0
    )
[16] => Array (
    [id] => 17
    [timestamp_start_ex] => Wed Mar  9 02:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 03:28:14 2016
    [timestamp_start] => 1457486894
    [timestamp_end] => 1457490494
    [orders] => 0
    )
[17] => Array (
    [id] => 18
    [timestamp_start_ex] => Wed Mar  9 01:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 02:28:14 2016
    [timestamp_start] => 1457483294
    [timestamp_end] => 1457486894
    [orders] => 0
    )
[18] => Array (
    [id] => 19
    [timestamp_start_ex] => Wed Mar  9 00:28:14 2016
    [timestamp_end_ex] => Wed Mar  9 01:28:14 2016
    [timestamp_start] => 1457479694
    [timestamp_end] => 1457483294
    [orders] => 0
    )
[19] => Array (
    [id] => 20
    [timestamp_start_ex] => Wed Mar  9 00:00:00 2016
    [timestamp_end_ex] => Wed Mar  9 00:28:14 2016
    [timestamp_start] => 1457478000
    [timestamp_end] => 1457479694
    [orders] => 0
    )

我想反转数组，意思是：

[0] => id = 19
[1] => id = 18
(...)
[19] => id => 1

我尝试使用ksort()但没有尝试，它不想重新组织数组。

Answer 1

function cmp($item1, $item2) {
    $a = intval($item1["id"]);
    $b = intval($item2["id"]);
    if ($a == $b) {
        return 0;
    }
    return ($a > $b) ? -1 : 1;
}

usort($array, "cmp");

Answer 2

krsort()将对键进行排序，这与id不同。您的示例显示了根据降序排序重新排序键。

最好在查询中执行ORDER BY id DESC，但是对于这个简单的示例，因为它们已经按升序排列：

$array = array_reverse($array);

如果尚未排序，则使用id提取array_column()数组，并按照相同顺序对$array进行排序时降序排序：

array_multisort(array_column($array, 'id'), SORT_DESC, $array);