自然排序在array_multisort

问题描述

是否有可能在PHP中使用自然排序进行排序多个列的多个维数组？下面是一个例子。假设我有数据的二维数组，如，

Is it possible to sort multiple dimensional array by multiple columns using natural sort in PHP? Here is an example. Suppose I have a 2D array of data, e.g.,

$array[1]['Name'] = 'John';
$array[1]['Age'] = '20';
$array[1]['Code'] = 'ABC 12';

$array[2]['Name'] = 'John';
$array[2]['Age'] = '21';
$array[2]['Code'] = 'ABC 1';

$array[3]['Name'] = 'Mary';
$array[3]['Age'] = '20';
$array[3]['Code'] = 'ABC 10';

我想这个排序数组的名字（ASC），然后按年龄（DESC），以及由code（ASC），一切都将自然排序。基本上将与自然排序进行在array_multisort。

I want to sort this array by name (ASC), then by age (DESC), and by code (ASC), all will be sorted naturally. Basically that will be array_multisort with natural sort.

我发现对网络上的这个话题很多解决方案。不幸的是，他们只用一列支持排序，而不是多列。

I found many solutions about this topic on the web. Unfortunately, they only support sorting by one column, not multiple column.

推荐答案

我认为你必须实施此行为的自定义比较函数：

I think you have to implement a custom comparison function for this behavior:

function myCmp($a, $b) {
 $nameCmp = strnatcasecmp($a['Name'], $b['Name']);
 $ageCmp = strnatcasecmp($a['Age'], $b['Age']);
 $codeCmp = strnatcasecmp($a['Code'], $b['Code']);

 if ($nameCmp != 0) // Names are not equal
   return($nameCmp);

 // Names are equal, let's compare age

 if ($ageCmp != 0) // Age is not equal
   return($ageCmp * -1); // Invert it since you want DESC

 // Ages are equal, we don't need to compare code, just return the comparison result
   return($codeCmp);
}

然后就可以调用 usort（$数组，'myCmp'）; 和应该得到所需的排序

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