PHP array_multisort - 如何保留键值？ [复制]

Question

如何对多维数组进行深度排序并保留其键？

$array = [
    '2' => [
        'title' => 'Flower',
        'order' => 3
    ],
    '3' => [
        'title' => 'Rock',
        'order' => 1
    ],
    '4' => [
        'title' => 'Grass',
        'order' => 2
    ]
];

foreach ($array as $key => $row) {
    $items[$key]  = $row['order'];
}

array_multisort($items, SORT_DESC, $array);

print_r($array);

结果：

Array
(
    [0] => Array
        (
            [title] => Flower
            [order] => 3
        )

    [1] => Array
        (
            [title] => Grass
            [order] => 2
        )

    [2] => Array
        (
            [title] => Rock
            [order] => 1
        )

)

我追求的是什么：

Array
(
    [2] => Array
        (
            [title] => Flower
            [order] => 3
        )

    [4] => Array
        (
            [title] => Grass
            [order] => 2
        )

    [3] => Array
        (
            [title] => Rock
            [order] => 1
        )

)

有什么想法吗？

Answer 1

可能这就是你要找的东西：Online Example

保留数组键，按顺序列排序并再次组合。

$keys = array_keys($array);
array_multisort(
    array_column($array, 'order'), SORT_DESC, SORT_NUMERIC, $array, $keys
);
$array = array_combine($keys, $array);
echo '<pre>';
print_r($array);

Answer 2

你可以试试uasort:

uasort($array, function ($a, $b) { return $b['order'] - $a['order']; });

您的代码：

<?php

$array = [
    '2' => [
        'title' => 'Flower',
        'order' => 3
    ],
    '3' => [
        'title' => 'Rock',
        'order' => 1
    ],
    '4' => [
        'title' => 'Grass',
        'order' => 2
    ]
];

uasort($array, function ($a, $b) { return $b['order'] - $a['order']; });

print_r($array);

Demo