Ds\Map::ksorted

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    Ds\Map::ksorted — Returns a copy, sorted by key

    Descrizione

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

    Returns a copy sorted by key, using an optional comparator function.

    Elenco dei parametri

    comparator

    La funzione di confronto deve restituire un intero minore, uguale o maggiore di zero se il primo argomento è considerato essere minore, uguale o maggiore del secondo.

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

    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.

    Valori restituiti

    Returns a copy of the map, sorted by key.

    Esempi

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

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

    print_r($map->ksorted());
    ?>

    Il precedente esempio visualizzerà qualcosa simile a:

    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);
    ?>

    Il precedente esempio visualizzerà qualcosa simile 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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