PHP SplDoublyLinkedList add() Function

The SplDoublyLinkedList::add() function is an inbuilt function in PHP which is used to add a new value at the given index. Syntax:

void SplDoublyLinkedList::add( $index, $newval )

Parameters: It contains two parameters as mentioned above and described below:

• $index: It holds the index value where the new element is to be inserted.
• $newval: It holds the element which to be inserted or added.

Return Value: It does not return any value. Below programs illustrate the SplDoublyLinkedList::add() function in PHP: Program 1: php

<?php 

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

// Use SplDoublyLinkedList::add() function to 
// add elements to the SplDoublyLinkedList
$list->add(0, 1); 

$list->add(1, "Geeks"); 

$list->add(2, "G"); 

$list->add(3, 10); 

print_r($list); 
?> 

Program 2: php

<?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');

print_r($list); 
?> 

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