PHP - 排序多维数组

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内部数组的键按字母顺序排序。 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数组来组织子数组，收集它的[last]键并从subsubsub数组的[last]键的alphabetization中对子子数组进行排序。

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);
}