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PHP | Ds\Map __construct() Function

Last Updated : 20 Aug, 2019
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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 
// 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 
// 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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