如何排序按姓氏$ P $名称的数组pserving键 [英] How to sort an array of names by surname preserving the keys

问题描述

我有一个数组如下：

Array(
    [27] => 'Sarah Green',
    [29] => 'Adam Brown',
    [68] => 'Fred Able'
);

我想用姓氏和preserve键对它进行排序：

I'd like to sort it by surname and preserve the keys:

Array(
    [68] => 'Fred Able'
    [29] => 'Adam Brown',
    [27] => 'Sarah Green'
);

有些名称可能有两个以上的名字，但它总是我要排序的最后名称。

Some names may have more than two first names, but it's always the very last name I want to sort on.

什么是在PHP中做到这一点的最好方法是什么？

What would be the best way to do this in PHP?

推荐答案

您可以使用 uasort 功能，它允许你指定一个自定义排序方法，同时preserving键：

You can use the uasort function, which allows you to specify a custom sorting method while also preserving keys:

<?php
// A function to sort by last name.
function lastNameSort($a, $b) {
    $aLast = end(explode(' ', $a));
    $bLast = end(explode(' ', $b));

    return strcasecmp($aLast, $bLast);
}

// The array of data.
$array = array(
    27 => 'Sarah Green',
    29 => 'Adam Brown',
    68 => 'Fred Able'
);

// Perform the sort:
uasort($array, 'lastNameSort');

// Print the result:
print_r($array);
?>

这里有一个演示。

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