在PHP中对关联数组进行排序

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？有内置功能吗？ 问题来源于stack overflow