如何在 php 中对多键进行排序？

Question

Array ( [0] => stdClass Object (    [Id] => 18 
                                [AccNo] => 1 
                                [Title] => Hardware 
                                [Description] => Mobile. 
                                [ManuDate] => 8th July 1942 
                                [MusCat] => Album 
                                [month] => 7 
                                [date] => 8 ) 
     [1] => stdClass Object (   [Id] => 20 
                                [AccNo] => 2 
                                [Title] => Food 
                                [Description] => Apple. 
                                [ManuDate] => 27th July 1942 
                                [MusCat] => Album 
                                [month] => 7 
                                [date] => 27 )
     [2] => stdClass Object (   [Id] => 24 
                                [AccNo] => 3 
                                [Title] => Hardware 
                                [Description] => Computer. 
                                [ManuDate] => 2nd July 1942 
                                [MusCat] => Album 
                                [month] => 7 
                                [date] => 2 )
     [3] => stdClass Object (   [Id] => 56 
                                [AccNo] => 4 
                                [Title] => Hardware 
                                [Description] => Printer 
                                [ManuDate] => 1942 
                                [MusCat] => Album 
                                [month] => 
                                [date] => 0 ) 
       [4] => stdClass Object ( [Id] => 105 
                                [AccNo] => 5 
                                [Title] => Object 
                                [Description] => Chair. 
                                [ManuDate] => 1942 
                                [MusCat] => Album 
                                [month] => 
                                [date] => 0 ) )

这是我的数组输入 Like

 Id Date                Title               Description

    0   8th July 1942       Hardware        Mobile
    1   27th August 1942    Food            Apple
    2   2nd July 1942       Hardware        Computer
    3   1942                Hardware        Printer
    4   1942                Object          Chair

我想要像

这样的输出

 Id Date                Title               Description
************************************************************
3   1942                Hardware             Printer
4   1942                Object               Chair
2   2nd July 1942       Hardware             Computer
0   8th July 1942       Hardware             Mobile
1   27th August 1942    Food                 Apple

如何在 php 中对多键进行排序？我是 Php 的初学者。我在 php 中使用以下代码，但输出不正确。如果按日期或按月排序中的任何一种，输出都会正确。否则两者（按日期或按月），输出都不会正确。请帮助任何解决方案。

usort($value['year'], function ($a, $b) {
     if ($a->date == $b->date) return 0;                    
    return $a->date < $b->date ? -1 : 1;
});     

usort($value['year'], function ($a, $b) {
    if ($a->month == $b->month) return 0;
    return $a->month < $b->month ? -1 : 1;
 });

Answer 1

下面的代码可以完成这项工作。 strtotime 将文本日期解析为 Unix 时间戳。

usort($array, function($v1, $v2) {
    $d1 = strlen($v1->ManuDate) === 4 ? '01-01-' . $v1->ManuDate : $v1->ManuDate;
    $d2 = strlen($v2->ManuDate) === 4 ? '01-01-' . $v2->ManuDate : $v2->ManuDate;
    return strtotime($d1) - strtotime($d2);
});

如何在 php 中对多键进行排序？

How to sort multikey in php?

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