在PHP中对关联数组进行排序[重复]

Question

This question already has an answer here:

• How can I sort arrays and data in PHP? 10 answers

I have an array in this format:

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
        )

)

How can I sort an array in that format, in the descending order of the avgSearchVolume field? Is there a built in function for this?

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Answer 1

Use usort and supply your own function to do the ordering, e.g.

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

usort($array, "cmp");