Question

可能重复：
How to sort arrays inside an array?

可能这很容易通过本机php函数实现，但我似乎无法在手册中找到它。我有类似下面的数组：

[0] (Array)#3
        [date_published] "2011-10-10 21:25:56"
        [domain] "gawker.com"
        [domain_rank] "909"
        [language] "en"
        [publisher] ""MAIN" via Steve in Google Reader"
        [title] "Genetically-modified salmon are closer than ever to a dinner plate near you [Genetic Engineering]"
        [url] "http://feeds.gawker.com/~r/io9/full/~3/s_6bCNerlW0/genetically+modified-salmon-are-closer-than-ever-to-a-dinner-plate-near-you"
      [1] (Array)#4
        [date_published] "2011-10-10 21:06:00"
        [domain] "huffingtonpost.com"
        [domain_rank] "85"
        [publisher] "PoliticsPolitics | Politics"
        [title] "John Geyman: Health Care: A Casualty of Class Warfare"
        [url] "http://feeds.huffingtonpost.com/~r/HP/Politics/~3/ZsqVSZMcWKM/health-care-statistics-america_b_990263.html"

我希望通过domain_rank订购它，我怎样才能通过PHP实现这个目标？

Answer 1

<?php
$array = array(
    array('domain_rank' => 909, 'a'), 
    array('domain_rank' => 100, 'b'),
    array('domain_rank' => 500, 'c'),
    array('domain_rank' => 100, 'd')
);
// since php 5.3
usort($array, function ($a, $b) {
    return $a['domain_rank'] > $b['domain_rank'];
});
// below php 5.3
function sortByDomainRank($a, $b) {
    return $a['domain_rank'] > $b['domain_rank'];
}
usort($array, 'sortByDomainRank');


print_r($array);
?>

比照http://php.net/manual/en/function.usort.php允许您为排序提供回调函数。

Answer 2

这是一种方式，而不是最好的方式。

function subval_sort($a,$subkey) {
    foreach($a as $k=>$v) {
        $b[$k] = strtolower($v[$subkey]);
    }
    asort($b);
    foreach($b as $key=>$val) {
        $c[] = $a[$key];
    }
    return $c;
}

$data = subval_sort($data,'domain_rank');

你也可以像这样使用Usort：

function compare($a, $b) {
    return ($a['domain_rank'] < $b['domain_rank']);
}

usort($data, 'compare');

Answer 3

根据您的具体需要，有几个PHP函数可以处理这个问题。看看php手册，因为它是你的朋友。最好的朋友甚至。

http://www.php.net/manual/en/array.sorting.php

PHP按顺序排序数组

3 个答案: