PHP | Ds\Map __construct() Function

The Ds\Map::__construct() function is an inbuilt function in PHP which is used to creates a new instance.

Syntax:

public Ds\Map::__construct( $values )

Parameter: This function accepts a single parameter $values which holds the traversable object or array to use initial values.

Below programs illustrate the Ds\Map::__construct() function in PHP:

Program 1:

<?php
// PHP program to illustrate the __construct()
// function of Ds\map

// Declare a new Map
$map = new \Ds\Map();

// Display the map elements
print_r($map);

// Creating a Map
$map = new \Ds\Map([
    "1" => "Geeks",
    "2" => "for",
    "3" => "Geeks"
]);

// Display the map elements
print_r($map);

?>

Output:

Ds\Map Object
(
)
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
        )

)

Program 2:

<?php
// PHP program to illustrate the __construct()
// function of Ds\map

// Creating a Map
$map = new \Ds\Map(["1" => "10",
            "2" => "20", "3" => 30]);

// Display key-value pair
print_r($map);

// Creating another Map
$map = new \Ds\Map([1 => "Welcome",
            2 => "to", 3 => "GeeksforGeeks"]);

// Display key-value pair
print_r($map);

?>

Output:

Ds\Map Object
(
    [0] => Ds\Pair Object
        (
            [key] => 1
            [value] => 10
        )

    [1] => Ds\Pair Object
        (
            [key] => 2
            [value] => 20
        )

    [2] => Ds\Pair Object
        (
            [key] => 3
            [value] => 30
        )

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

    [1] => Ds\Pair Object
        (
            [key] => 2
            [value] => to
        )

    [2] => Ds\Pair Object
        (
            [key] => 3
            [value] => GeeksforGeeks
        )

)

Reference: https://www.php.net/manual/en/ds-map.construct.php