Php/docs/ds-map.union

• PHP Manual
• Map
• Creates a new map using values from the current instance and another map

Ds\Map::union

(PECL ds >= 1.0.0)

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

Description

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}

Note:

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

Parameters

map

The other map, to combine with the current instance.

Return Values

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

See Also

• » Union on Wikipedia

Examples

Example #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));?>

The above example will output something similar to:

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
        )

)