不能使用usort按键排序数组

Question

我有和数组看起来像这样

Array
(
    [0] => Array
        (
            [key] => 0
            [val] => 0
        )

    [1] => Array
        (
            [key] => 11
            [val] => 1:1
        )

    [2] => Array
        (
            [key] => 1100
            [val] => 1:100
        )

    [3] => Array
        (
            [key] => 112
            [val] => 1:12
        )

    [4] => Array
        (
            [key] => 1144
            [val] => 1:144
        )

    [5] => Array
        (
            [key] => 1146
            [val] => 1:146
        )

    [6] => Array
        (
            [key] => 116
            [val] => 1:16
        )

    [7] => Array
        (
            [key] => 118
            [val] => 1:18
        )

    [8] => Array
        (
            [key] => 120
            [val] => 1:20

我想通过数组中的KEY键对其进行排序

我使用以下代码

     usort($arrScale,"cmd");

function cmp($a, $b)
{
    if ($a["key"] == $b["key"]) {
        return 0;
    }
    return ($a["key"] < $b["key"]) ? -1 : 1;
}

1100和1144应该更接近尾声？我做错了吗？

Answer 1

键值是字符串，按字符串比较规则“1144”比“116”小“。将它们转换为int以进行比较。

function cmp($a, $b) 
{ 
    $aKey = (int) $a["key"];
    $bKey = (int) $b["key"];

    if ($aKey == $bKey) { 
        return 0; 
    } 
    return ($aKey < $bKey) ? -1 : 1; 
}