PHP多维数组(usort)

Question

我有一个关联数组，如下所示

Array
(
    ["News 1"] => Array
        (
            [text] => tests
            [language] => 
            [advertiserCompetitionScale] => 5
            [avgSearchVolume] => 7480000
            [lastMonthSearchVolume] => 9140000
        )

    ["News 2"] => Array
        (
            [text] => personality tests
            [language] => 
            [advertiserCompetitionScale] => 5
            [avgSearchVolume] => 165000
            [lastMonthSearchVolume] => 201000
        )

    ["News 3] => Array
        (
            [text] => online tests
            [language] => 
            [advertiserCompetitionScale] => 5
            [avgSearchVolume] => 246000
            [lastMonthSearchVolume] => 301000
        )

)

我设法按我想要的列对其进行排序(例如LastMonthSearchVolume)

// compare function 
function cmpi($a, $b) 
{ 

     return strcmp($a["lastMonthSearchVolume"], $b["lastMonthSearchVolume"]); 
} 

// do the array sorting 
usort($latest_array, 'cmpi');

问题是，当我转储数组以查看结果时，usort通过删除“News1”、“News2”等来破坏我的关联数组。并将其替换为0,1,2...

有没有办法让sort保留列名？

谢谢

Answer 1

使用函数uasort代替usort，该函数保留了索引关联。

Answer 2

请改用uasort。usort不维护关联键，而uasort维护关联键。