PHP | Ds\Map __construct() Function

Last Updated : 20 Aug, 2019

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

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