Ds\Map::ksort

(PECL ds >= 1.0.0)

Ds\Map::ksort — Sorts the map in-place by key

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public Ds\Map::ksort ([ callable $comparator ] ) : void

Sorts the map in-place by key, using an optional comparator function.

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comparator

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callback ( mixed $a, mixed $b ) : int
Caution

Returning non-integer values from the comparison function, such as float, will result in an internal cast to integer of the callback's return value. So values such as 0.99 and 0.1 will both be cast to an integer value of 0, which will compare such values as equal.

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Example #1 Ds\Map::ksort() example

<?php
$map = new \Ds\Map(["b" => 2, "c" => 3, "a" => 1]);
$map->ksort();

print_r($map);
?>

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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::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);
?>

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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
        )

)