PHP - 对多维数组进行排序

Question

我有一个多维数组

Array
 (
[M] => Array
    (
        [0] => Array
            (
                [first] => Paul
                [last] => Martha
                [progress] => 100
                [id] => 85162
                [category] => M
            )

        [1] => Array
            (
                [first] => Bob
                [last] => Marley
                [progress] => 47
                [id] => 846523
                [category] => M
            )

    )

[M~F1] => Array
    (
        [0] => Array
            (
                [first] => Kenneth
                [last] => Rodriguez
                [progress] => 42
                [id] => 110273
                [category] => M~F1
            )

        [1] => Array
            (
                [first] => Jenifer
                [last] => Lopez
                [progress] => 0
                [id] => 485623
                [category] => M~F1
            )

    )

)

但是，我希望每个较小的数组根据其中的数组中的键按字母顺序对自己进行排序。以数组 M 为例。我希望 PHP 通过按字母顺序排列姓氏组件来组织其子组件。因此，数组 M 将通过按字母顺序排列子数组的子数组来组织其子数组。完成后，它应该如下所示：

Array
(
[M] => Array
    (
    [0] => Array
            (
                [first] => Bob
                [last] => Marley
                [progress] => 47
                [id] => 846523
                [category] => M
            )

        [1] => Array
            (
                [first] => Paul
                [last] => Martha
                [progress] => 100
                [id] => 85162
                [category] => M
            )

    )

[M~F1] => Array
    (
        [0] => Array
            (
        [first] => Jenifer
                [last] => Lopez
                [progress] => 0
                [id] => 485623
                [category] => M~F1
            )

        [1] => Array
            (
                [first] => Keneth
                [last] => Rodriguez
                [progress] => 42
                [id] => 110273
                [category] => M~F1
            )

    )

)

因此，回顾一下，我需要通过查看 subsubsub 数组、收集其 [last] 键并根据 subsubsub 数组的 [last] 键的字母顺序对 subsub 数组进行排序来组织 subsub 数组。

Answer 1

让你定义的数组为 $x。

// first, define our comparison function
$cmp = function ($a, $b) {
  // sort by last name, first name
  $a = trim($a['last'] . ' ' . $a['first']);
  $b = trim($b['last'] . ' ' . $b['first']);
  return strcmp($a, $b);
};
foreach ($x as &$subx) {
  // initialize sub array with reference
  usort($subx, $cmp);
}