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Ds\Map::ksorted

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Ds\Map::ksortedReturns a copy, sorted by key

说明

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

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

参数

comparator

在第一个参数小于,等于或大于第二个参数时,该比较函数必须相应地返回一个小于,等于或大于 0 的整数。

callback(mixed $a, mixed $b): int
警告

从比较函数中返回非整数值,例如 float,将导致内部强制转换为 callback 返回值为 int。因此,诸如 0.990.1 之类的值都将被转换为整数值 0,将这些值比较的话将会是相等。

返回值

Returns a copy of the map, sorted by key.

示例

示例 #1 Ds\Map::ksorted() example

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

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

以上示例的输出类似于:

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);
?>

以上示例的输出类似于:

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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