Ds\Map::ksort

(PECL ds >= 1.0.0)

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

Descrição

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

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

Parâmetros

comparator

A função de comparação deve retornar um inteiro menor que, igual ou maior que zero se o primeiro argumento for considerado respectivamente menor que, igual ou maior que o segundo.

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

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.

Valor Retornado

Nenhum valor é retornado.

Exemplos

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

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

print_r($map);
?>

O exemplo acima produzirá algo semelhante 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
        )

)

Exemplo #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);
?>

O exemplo acima produzirá algo semelhante 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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