如何在PHP中按长度对二维数组排序 - How can I sort a two-dimensional array by length in PHP?

How can I sort a two-dimensional array by length in PHP?

本文关键字：数组排序二维 PHP | 更新日期: 2023-09-27

我有一个字符串数组，我想按长度降序排序。然而，它是一个二维数组，我不确定如何实现一个函数，将做我想要的。

下面是一个数组的例子:

Array
(
  [0] => Array
    (
      [0] => "abc"
      [1] => "def"
      [2] => "1234"
    )
  [1] => Array
    (
      [0] => "ghijkl"
      [1] => "092"
      [2] => "234234"
    )
  [2] => Array
    (
      [0] => "mn"
      [1] => "opq"
      [2] => "67843"
    )
)

我只对子数组中第一项的长度感兴趣。理想情况下，它最终看起来像这样:

Array
(
  [0] => Array
    (
      [0] => "ghijkl"
      [1] => "092"
      [2] => "234234"
    )
  [1] => Array
    (
      [0] => "abc"
      [1] => "def"
      [2] => "1234"
    )
  [2] => Array
    (
      [0] => "mn"
      [1] => "opq"
      [2] => "67843"
    )
)

谢谢你给我的任何帮助

usort($array, function ($a, $b) { return strlen($b[0]) - strlen($a[0]); });

(使用PHP 5.3语法)

<?php
$your_array = array
(
  array
    (
      "abc",
      "def",
      "1234"
    ),
  array
    (
      "ghijkl",
      "092",
      "234234"
    ),
array
    (
      "mn",
      "opq",
      "67843"
    )
);
function customSort(Array $a, Array $b){         
     return strlen($b[0]) - strlen($a[0]);  
}
usort($your_array, 'customSort');
var_dump($your_array);