Ds\Map::ksort

    (PECL ds >= 1.0.0)

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

    Descripción

    public Ds\Map::ksort(callable $comparator = ?): void

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

    Parámetros

    comparator

    La función de comparación debe devolver un entero menor, igual o mayor que cero si el primer argumento se considera que sea respectivamente menor, igual o mayor que el segundo. Observe que antes de PHP 7.0.0 este entero debía estar en el rango de -2147483648 a 2147483647.

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

    Returning non-integer values from the comparison function, such as float, will result in an internal cast to int 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.

    Valores devueltos

    No devuelve ningún valor.

    Ejemplos

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

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

    print_r($map);
    ?>

    El resultado del ejemplo sería algo similar a:

    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
        )

)

    Ejemplo #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);
    ?>

    El resultado del ejemplo sería algo similar a:

    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
        )

)

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