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Ds\Map::ksorted

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

說(shuō)明

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

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

參數

comparator

在第一個(gè)參數小于，等于或大于第二個(gè)參數時(shí)，該比較函數必須相應地返回一個(gè)小于，等于或大于 0 的整數。

callback(mixed $a, mixed $b): int
警告

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.

返回值

Returns a copy of the map, sorted by key.

范例

示例 #1 Ds\Map::ksorted() example

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

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

以上例程的輸出類(lèi)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
        )

)

示例 #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);
?>

以上例程的輸出類(lèi)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
        )

)
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