php - 保持数值索引关联的array_multisort

This question already has answers here:

How can I sort arrays and data in PHP?

(13个回答)


4年前关闭。




我可以对多维数组进行排序，但不保留数字索引关联。

如何保持数字索引关联？

CODE:

$waiters[76] = array('weight' => 67, 'specialties' => 1);
$waiters[14] = array('weight' => 41, 'specialties' => 2);
$waiters[58] = array('weight' => 85, 'specialties' => 3);
$waiters[89] = array('weight' => 98, 'specialties' => 4);
$waiters[68] = array('weight' => 86, 'specialties' => 5);
$waiters[31] = array('weight' => 13, 'specialties' => 6);
print_r($waiters);
// Obtain a list of waiters
foreach ($waiters as $id => $waiter) {
    $weight[$id]        = $waiter['weight'];
    $specialties[$id]   = $waiter['specialties'];

}

// Sort the data with weight descending, specialties ascending
// Add $data as the last parameter, to sort by the common key
array_multisort(
    $weight, SORT_DESC, SORT_NUMERIC,
    $specialties, SORT_ASC, SORT_NUMERIC,
    $waiters
);
print_r($waiters);

输出:

Array
(
    [0] => Array
        (
            [weight] => 98
            [specialties] => 4
        )

    [1] => Array
        (
            [weight] => 86
            [specialties] => 5
        )

    [2] => Array
        (
            [weight] => 85
            [specialties] => 3
        )

    [3] => Array
        (
            [weight] => 67
            [specialties] => 1
        )

    [4] => Array
        (
            [weight] => 41
            [specialties] => 2
        )

    [5] => Array
        (
            [weight] => 13
            [specialties] => 6
        )

)

期望的输出:

Array
(
    [89] => Array
        (
            [weight] => 98
            [specialties] => 4
        )

    [68] => Array
        (
            [weight] => 86
            [specialties] => 5
        )

    [58] => Array
        (
            [weight] => 85
            [specialties] => 3
        )

    [76] => Array
        (
            [weight] => 67
            [specialties] => 1
        )

    [14] => Array
        (
            [weight] => 41
            [specialties] => 2
        )

    [31] => Array
        (
            [weight] => 13
            [specialties] => 6
        )

)

最佳答案

$keys = array_keys($waiters);
array_multisort(
    $weight, SORT_DESC, SORT_NUMERIC,
    $specialties, SORT_ASC, SORT_NUMERIC,
    $waiters, $keys
);
$waiters = array_combine($keys, $waiters);

或使用uasort

uasort(
    $data,
    function ($some_data, $another_data) {

        $result = 0;

        if ($some_data['weight'] > $another_data['weight']) {
            $result = -1;
        } elseif ($some_data['weight'] < $another_data['weight']) {
            $result = 1;
        } elseif ($some_data['specialties'] > $another_data['specialties']) {
            $result = 2;
        } elseif ($some_data['specialties'] < $another_data['specialties']) {
            $result = -2;
        }

        return $result;

    }
);

但是uasort的性能明显不如array_multisort

关于php - 保持数值索引关联的array_multisort，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/23740747/