PHP | Ds\Set first() Function

The Ds\Set::first() function is an inbuilt function in PHP which returns the first element of the Set.

Syntax:

void public Ds\Set::first( void )

Parameter: This function does not accept any parameter.

Return value: This function returns the first value of the Set.

Below programs illustrate the Ds\Set::first() function in PHP:

Program 1:  

PHP

<?php

// PHP program to illustrate the
// Ds\set::first() function

// Create a set instance
$set = new \Ds\Set();

// Adding elements to Set
$set->add("Welcome");
$set->add("to");
$set->add("GfG");

// Print the first element from set
print_r($set->first());

?>

Output:

Welcome

Program 2: 

PHP

<?php

// PHP program to illustrate the
// Ds\set::first() function

// Create a set instance
$set = new \Ds\Set();

// Adding elements to Set
$set->add("10");
$set->add("20");
$set->add("30");

// Print the first element from set
print_r($set->first());

?>

Output:

10

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