Question

我有一个像这样的多维数组：

array ([0] => array ([id] => 1 [name] => john doe [title] => Mr [days] => 10) 
[1] => array ([id] => 2 [name] => Joe Smith [title] => Dr [days] => 22) 
[2] => array ([id] => 3 [name] => John Jones [title] => Mr [days] => 3))

我需要对内部数组进行排序，以便按日期键以自然顺序返回数据。

I.E喜欢这样：

array ([2] => array ([id] => 3 [name] => John Jones [title] => Mr [days] => 3)
[0] => array ([id] => 1 [name] => john doe [title] => Mr [days] => 10) 
[1] => array ([id] => 2 [name] => Joe Smith [title] => Dr [days] => 22))

我认为我需要的是一个通过$ key将natsort应用于多维数组的函数，但到目前为止，我还没有找到任何除标准排序之外的任何函数。

任何帮助？

Answer 1

你想要的是usort。

您可以编写回调来为您进行比较：

usort($data, function($a, $b) {
    return ($a['days'] > $b['days'])
           ? 1 
           : ($a['days'] < $b['days'])
             ? -1 
             : 0;
});

免责声明：您需要PHP 5.3.x才能使用此功能，否则您必须使用create_function或预定义比较功能。

Answer 2

有点不同的做法：

$days = array();
foreach($array as $key => $val) {
    $days[$key] = $val['days'];
}
array_multisort($days, $array); //$array being your input array

<强>结果：

Array
(
    [0] => Array
        (
            [id] => 3
            [name] => Jay Doe
            [title] => Mr
            [days] => 3
        )

    [1] => Array
        (
            [id] => 1
            [name] => John Doe
            [title] => Mr
            [days] => 10
        )

    [2] => Array
        (
            [id] => 2
            [name] => Joe Doe
            [title] => Mr
            [days] => 22
        )

)

Answer 3

以下内容对我有用

usort($array, function($a, $b) {
    return strnatcasecmp($a['days'], $b['days']);
});

从这里找到：-https://learntech.imsu.ox.ac.uk/blog/php-naturally-sorting-multidimension-arrays-by-string-values/

希望有人会发现这很有用。

natsort多维数组

3 个答案: