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    Ds\Map::union

    (PECL ds >= 1.0.0)

    Ds\Map::union — Creates a new map using values from the current instance and another map

    説明

    public Ds\Map::union(Ds\Map $map): Ds\Map

    Creates a new map that contains the pairs of the current instance as well as the pairs of another map.

    A ∪ B = {x: x ∈ A ∨ x ∈ B}

    注意:

    Values of the current instance will be overwritten by those provided where keys are equal.

    パラメータ

    map

    The other map, to combine with the current instance.

    戻り値

    A new map containing all the pairs of the current instance as well as another map.

    参考

    例

    例1 Ds\Map::union() example

    <?php
    $a     = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]);
    $b = new \Ds\Map(["b" => 3, "c" => 4, "d" => 5]);

    print_r($a->union($b));
    ?>

    上の例の出力は、 たとえば以下のようになります。

    Ds\Map Object
(
    [0] => Ds\Pair Object
        (
            [key] => a
            [value] => 1
        )

    [1] => Ds\Pair Object
        (
            [key] => b
            [value] => 3
        )

    [2] => Ds\Pair Object
        (
            [key] => c
            [value] => 4
        )

    [3] => Ds\Pair Object
        (
            [key] => d
            [value] => 5
        )

)

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