PHP - Manual: Ds\Map::ksort
2025-10-25
(PECL ds >= 1.0.0)
Ds\Map::ksort — Sorts the map in-place by key
Sorts the map in-place by key, using an optional comparator function.
comparator在第一个参数小于,等于或大于第二个参数时,该比较函数必须相应地返回一个小于,等于或大于 0 的整数。
没有返回值。
示例 #1 Ds\Map::ksort() example
<?php
$map = new \Ds\Map(["b" => 2, "c" => 3, "a" => 1]);
$map->ksort();
print_r($map);
?>以上示例的输出类似于:
Ds\Map Object
(
[0] => Ds\Pair Object
(
[key] => a
[value] => 1
)
[1] => Ds\Pair Object
(
[key] => b
[value] => 2
)
[2] => Ds\Pair Object
(
[key] => c
[value] => 3
)
)
示例 #2 Ds\Map::ksort() example using a comparator
<?php
$map = new \Ds\Map([1 => "x", 2 => "y", 0 => "z"]);
// Reverse
$map->ksort(function($a, $b) {
return $b <=> $a;
});
print_r($map);
?>以上示例的输出类似于:
Ds\Map Object
Ds\Map Object
(
[0] => Ds\Pair Object
(
[key] => 2
[value] => y
)
[1] => Ds\Pair Object
(
[key] => 1
[value] => x
)
[2] => Ds\Pair Object
(
[key] => 0
[value] => z
)
)