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PHP | Ds\Pair __construct() Function

Last Updated : 30 Jul, 2019

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

Syntax:

public Ds\Pair::__construct( $key, $value )

Parameters: This function accepts two parameters as mentioned above and described below:

$key: This parameter holds the key of the pair element.
$value: This parameter holds the value of the pair element.

Return Value: This function does not return any value.

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

Program 1:

<?php  
// PHP program to illustrate the  
// Ds\Pair::__construct() function 
  
// Declare a new pair  
$pair = new \Ds\Pair();  
  
// Display the pair elements  
print_r($pair);  
  
// Creating another pair  
$pair = new \Ds\pair( 
    ["1", "2", "3"], 
    ["Geeks", "for", "Geeks"] 
); 
  
// Display the pair elements  
print_r($pair);  
  
?> 

Output:

Ds\Pair Object
(
    [key] => 
    [value] => 
)
Ds\Pair Object
(
    [key] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
        )

    [value] => Array
        (
            [0] => Geeks
            [1] => for
            [2] => Geeks
        )

)

Program 2:

<?php  
// PHP program to illustrate the  
// Ds\Pair::__construct() function 
  
// Creating a pair  
$pair = new \Ds\pair( 
    ["a", "b", "c"], 
    ["10", "2", "30"] 
); 
  
// Display the pair elements  
var_dump($pair);  
  
?> 

Output:

object(Ds\Pair)#1 (2) {
  ["key"]=>
  array(3) {
    [0]=>
    string(1) "a"
    [1]=>
    string(1) "b"
    [2]=>
    string(1) "c"
  }
  ["value"]=>
  array(3) {
    [0]=>
    string(2) "10"
    [1]=>
    string(1) "2"
    [2]=>
    string(2) "30"
  }
}

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

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