PHP:按其值的长度对数组进行排序? [英] PHP: Sort an array by the length of its values?

问题描述

我制作了一个字谜机器，我有一系列正匹配.问题是它们的顺序不同，我希望能够对数组进行排序，以便最长的数组值首先出现.

I made an anagram machine and I have an array of positive matches. The trouble is they are all in a different order, I want to be able to sort the array so the longest array values appear first.

有人对如何做到这一点有任何想法吗?

Anybody have any ideas on how to do this?

推荐答案

使用 http://us2.php.net/manual/en/function.usort.php

使用这个自定义函数

function sort($a,$b){
    return strlen($b)-strlen($a);
}

usort($array,'sort');

如果您想保留旧索引，请使用 uasort，如果您不关心，请使用 usort.

Use uasort if you want to keep the old indexes, use usort if you don't care.

另外，我相信我的版本更好，因为 usort 是一种不稳定的排序.

Also, I believe that my version is better because usort is an unstable sort.

$array = array("bbbbb", "dog", "cat", "aaa", "aaaa");
// mine
[0] => bbbbb
[1] => aaaa
[2] => aaa
[3] => cat
[4] => dog

// others
[0] => bbbbb
[1] => aaaa
[2] => dog
[3] => aaa
[4] => cat

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