PHP SplDoublyLinkedList next() Function

The SplDoublyLinkedList::next() function is an inbuilt function in PHP which is used to move the index into next index.

Syntax:

void SplDoublyLinkedList::next( void )

Parameters: This function does not accept any parameter.

Return Value: It does not return any value.

Below programs illustrate the SplDoublyLinkedList::next() function in PHP:

Program 1:

<?php

// Declare an empty SplDoublyLinkedList
$list = new \SplDoublyLinkedList;

// Use SplDoublyLinkedList::add() function to
// add elements to the SplDoublyLinkedList
$list->add(0, 30);
$list->add(1, 20);
$list->add(2, 30);
$list->add(3, "Geeks");
$list->add(4, 'G');
$list->rewind();

// Use SplDoublyLinkedList::current() function
// to get the current element
var_dump($list->current());

// Use next() function to increment
// the index value
$list->next();

// Use SplDoublyLinkedList::current() function
// to get the current element
var_dump($list->current());

?>

Output:

int(30)
int(20)

Program 2:

<?php

// Declare an empty SplDoublyLinkedList
$list = new \SplDoublyLinkedList();

// Use SplDoublyLinkedList::push() function to
// add elements to the SplDoublyLinkedList
$list->push(1);
$list->push(2);
$list->push(3);
$list->push(8);
$list->push(5);

$list->rewind();

// Use SplDoublyLinkedList::current() function
// to get the current element
var_dump($list->current());

// Use next() function to increment
// the index value
$list->next();
$list->next();
$list->next();

// Use SplDoublyLinkedList::current() function
// to get the current element
var_dump($list->current());

?>

Output:

int(1)
int(8)

Reference: https://www.php.net/manual/en/spldoublylinkedlist.next.php