PHP - Ds Pair::__construct() Function

The PHP Ds\Pair::__construct() function is used to create a new instance of a pair. This new instance refers to an object of the Ds\Pair class.

Syntax

Following is the syntax of the PHP Ds\Pair::__construct() function −

public Ds\Pair::__construct(mixed $values = ?)

Parameters

Following is the parameter of this function −

• values − A traversable object or an array to use for the initial values.

Return value

This function does not return any value.

Example 1

The following is the basic example of the PHP Ds\Pair::__construct() function −

<?php
   $pair = new \Ds\Pair();
   print_r($pair);
   # declare another pair
   $pair  = new \DS\Pair(['a', 'b', 'c'],[10, 20, 30]);
   print_r($pair);
?>

Output

The above program produces the following output −

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

    [value] => Array
        (
            [0] => 10
            [1] => 20
            [2] => 30
        )

)

Example 2

Following is another example of the PHP Ds\Pair::__construct() function. We use this function to create new instances −

<?php
   $pair = new \Ds\Pair([1, 2, 3],['a', 'e', 'i']);
   print_r($pair);
   # declare another pair
   $pair  = new \DS\Pair([1, 2, 3, 4, 5], ['a', 'e', 'i', 'o', 'u']);
   print_r($pair);
?>

Output

After executing the above program, the following output will be displayed −

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

    [value] => Array
        (
            [0] => a
            [1] => e
            [2] => i
        )

)
Ds\Pair Object
(
    [key] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 4
            [4] => 5
        )

    [value] => Array
        (
            [0] => a
            [1] => e
            [2] => i
            [3] => o
            [4] => u
        )

)