PHP | Ds\Map first() Function

The Ds\Map::first() function of PHP Ds\Map class is used to get the first key-value pair from the Map instance. Syntax:

Ds\Pair public Ds\Map::first ( )

Parameters: This function does not accepts any parameter. Return value: It returns a pair of type Ds\Pair which is the first key-value pair from the Map instance. That is the key-value pair present at the front of the Map instance. Below programs illustrate the Ds\Map::first() function in PHP: Program 1: php

<?php
// PHP program to illustrate first() function

$map = new \Ds\Map([1 => "Geeks", 2 => "for", 
                                3 => "Geeks"]);

print_r($map->first());

?>

Output:

Ds\Pair Object
(
    [key] => 1
    [value] => Geeks
)

Program 2: php

<?php
// PHP program to illustrate first() function

$map = new \Ds\Map(["first" => "Geeks", "second" => "for", 
                                "third" => "Geeks"]);

print_r($map->first());

?>

Output:

Ds\Pair Object
(
    [key] => first
    [value] => Geeks
)

Reference: http://php.net/manual/en/ds-map.first.php