php - 我可以根据值使用 usort 在 php 中对数组进行排序吗

Question

我想根据最终得分对这个数组进行排序，并保留我的 key 。我可以使用 usort 吗？怎么样？

Array
(
[2253472] => Array
    (
        [noOfDays] => 1
        [bestAns] => 1
        [finalScore] => 13.5
    )

[2253465] => Array
    (
        [noOfDays] => 1
        [bestAns] => 0
        [finalScore] => 50
    )

[2253473] => Array
    (
        [noOfDays] => 1
        [bestAns] => 0
        [finalScore] => 23
    )

[2253471] => Array
    (
        [noOfDays] => 1
        [bestAns] => 0
        [finalScore] => 89
    )

[2253464] => Array
    (
        [noOfDays] => 1
        [bestAns] => 1
        [finalScore] => 0.5
    )

[2253415] => Array
    (
        [noOfDays] => 6
        [bestAns] => 0
        [finalScore] => 0.333
    )
)

Answer 1

你只需要

// Ascending
usort($data, function ($a, $b) {
    return $a['finalScore'] - $b['finalScore'];
});

或

// Descending
usort($data, function ($a, $b) {
    return $b['finalScore'] - $a['finalScore'];
});