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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