在PHP中对关联数组进行排序

Question

我有这种格式的数组：

Array
(
    [0] => Array
        (
            [text] => tests
            [language] => 
            [advertiserCompetitionScale] => 5
            [avgSearchVolume] => 7480000
            [lastMonthSearchVolume] => 9140000
        )

    [1] => Array
        (
            [text] => personality tests
            [language] => 
            [advertiserCompetitionScale] => 5
            [avgSearchVolume] => 165000
            [lastMonthSearchVolume] => 201000
        )

    [2] => Array
        (
            [text] => online tests
            [language] => 
            [advertiserCompetitionScale] => 5
            [avgSearchVolume] => 246000
            [lastMonthSearchVolume] => 301000
        )

)

如何按该avgSearchVolume字段的降序对该格式的数组排序？是否有内置功能？

Answer 1

使用usort并提供您自己的功能进行订购，例如

function cmp($a, $b)
{
    return $b['avgSearchVolume'] - $a['avgSearchVolume'];
}

usort($array, "cmp");