我有一个数组需要按三级排序。

我需要按 fullname 值对数组进行排序。这可能吗？

$array = array(
    'family1' => array(
        'family_data' => array(
            'fullname' => 'Samuel Smith',
            '...' => '...'
        )
    ),
    'family2' => array(
        'family_data' => array(
            'fullname' => 'John Doe',
            '...' => '...'
        )
    ),
    'family3' => array(
        'family_data' => array(
            'fullname' => 'Adrian Chan',
            '...' => '...'
        )
    )
);

更容易阅读:

Array
(
    [family1] => Array
        (
            [family_data] => Array
                (
                    [fullname] => Samuel Smith
                    [...] => ...
                )

        )

    [family2] => Array
        (
            [family_data] => Array
                (
                    [fullname] => John Doe
                    [...] => ...
                )

        )

    [family3] => Array
        (
            [family_data] => Array
                (
                    [fullname] => Adrian Chan
                    [...] => ...
                )

        )

)

期望的结果是:

Array
(
    [family3] => Array
        (
            [family_data] => Array
                (
                    [fullname] => Adrian Chan
                    [...] => ...
                )

        )

    [family2] => Array
        (
            [family_data] => Array
                (
                    [fullname] => John Doe
                    [...] => ...
                )

        )

    [family1] => Array
        (
            [family_data] => Array
                (
                    [fullname] => Samuel Smith
                    [...] => ...
                )

        )

)

最佳答案

使用uasort

uasort — Sort an array with a user-defined comparison function and maintain index association

uasort($array, function($a, $b) {
    return strcmp($a['family_data']['fullname'], $b['family_data']['fullname']);
});

测试:

$array = array(
    'family1' => array(
        'family_data' => array(
            'fullname' => 'Ben Smith',
            '...' => '...',
            '...' => '...'
        ),
        '...' => '...',
        '...' => '...'
    ),
    'family2' => array(
        'family_data' => array(
            'fullname' => 'John Doe',
            '...' => '...',
            '...' => '...'
        ),
        '...' => '...',
        '...' => '...'
    ),
    'family3' => array(
        'family_data' => array(
            'fullname' => 'Aen Smith',
            '...' => '...',
            '...' => '...'
        ),
        '...' => '...',
        '...' => '...'
    ),
);

uasort($array, function($a, $b) {
    return strcmp($a['family_data']['fullname'], $b['family_data']['fullname']);
});

print_r($array);

输出:

Array
(
    [family3] => Array
        (
            [family_data] => Array
                (
                    [fullname] => Aen Smith
                    [...] => ...
                )

            [...] => ...
        )

    [family1] => Array
        (
            [family_data] => Array
                (
                    [fullname] => Ben Smith
                    [...] => ...
                )

            [...] => ...
        )

    [family2] => Array
        (
            [family_data] => Array
                (
                    [fullname] => John Doe
                    [...] => ...
                )

            [...] => ...
        )

)

关于PHP Sort Array By SubArray Value by 第三级，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16582086/