The Ds\Map::merge() function is an inbuilt function in PHP which is used to return the result of adding all given associations.
Syntax:
Ds\Map public Ds\Map::merge( $values )
Parameter: This function accepts single parameter $values which holds the traversable object or an array.
Return value: This function returns the associating all keys of a given traversable object or array with their corresponding values, combined with the current instance.
Below programs illustrate the Ds\Map::merge() function in PHP:
Program 1:
<?php    // Create new map $map = new \Ds\Map(["a" => 12,     "b" => 15, "c" => 18, "d" => 20]);    // Merge the map element and display it print_r($map->merge(["a" => 1, "c" => 2, "f" => 3]));    // Display the set element print_r($map)   ?> |
Output:
Ds\Map Object
(
[0] => Ds\Pair Object
(
[key] => a
[value] => 1
)
[1] => Ds\Pair Object
(
[key] => b
[value] => 15
)
[2] => Ds\Pair Object
(
[key] => c
[value] => 2
)
[3] => Ds\Pair Object
(
[key] => d
[value] => 20
)
[4] => Ds\Pair Object
(
[key] => f
[value] => 3
)
)
Ds\Map Object
(
[0] => Ds\Pair Object
(
[key] => a
[value] => 12
)
[1] => Ds\Pair Object
(
[key] => b
[value] => 15
)
[2] => Ds\Pair Object
(
[key] => c
[value] => 18
)
[3] => Ds\Pair Object
(
[key] => d
[value] => 20
)
)
Program 2:
<?php    // Create new map $map = new \Ds\Map(["1" => "Geeks",         "2" => "for", "3" => "Geeks"]);    // Merge the map element and display it print_r($map->merge(["a" => "Computer",         "b" => "Science", "c" => "Portal"]));   ?> |
Output:
Ds\Map Object
(
[0] => Ds\Pair Object
(
[key] => 1
[value] => Geeks
)
[1] => Ds\Pair Object
(
[key] => 2
[value] => for
)
[2] => Ds\Pair Object
(
[key] => 3
[value] => Geeks
)
[3] => Ds\Pair Object
(
[key] => a
[value] => Computer
)
[4] => Ds\Pair Object
(
[key] => b
[value] => Science
)
[5] => Ds\Pair Object
(
[key] => c
[value] => Portal
)
)
