array_multisort 与自然排序

问题描述

是否可以在 PHP 中使用自然排序按多列对多维数组进行排序?这是一个例子.假设我有一个二维数据数组，例如，

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';

我想按名称(ASC)，然后按年龄(DESC)和按代码(ASC)对这个数组进行排序，所有这些都会自然排序.基本上这将是具有自然排序的 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.

我在网上找到了很多关于这个主题的解决方案.不幸的是，它们只支持按一列排序，而不支持按多列排序.

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

我认为您必须为此行为实现自定义比较函数:

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);
}

然后你可以调用 usort($array, 'myCmp'); 并且应该得到想要的排序

Then you can call usort($array, 'myCmp'); and should get the desired sorting

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