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Ds\Map::ksorted — Returns a copy, sorted by key
Returns a copy sorted 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。
Returns a copy of the map, sorted by key.
Example #1 Ds\Map::ksorted() example
<?php
$map = new \Ds\Map(["b" => 2, "c" => 3, "a" => 1]);
print_r($map->ksorted());
?>
以上例程的输出类似于：
Ds\Map Object
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
)
)
Example #2 Ds\Map::ksorted() example using a comparator
<?php
$map = new \Ds\Map([1 => "x", 2 => "y", 0 => "z"]);
// Reverse
$sorted = $map->ksorted(function($a, $b) {
return $b <=> $a;
});
print_r($sorted);
?>
以上例程的输出类似于：
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
)
)