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   // 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); ?> |
Output:
SplDoublyLinkedList Object
(
[flags:SplDoublyLinkedList:private] => 0
[dllist:SplDoublyLinkedList:private] => Array
(
[0] => 1
[1] => Geeks
[2] => G
[3] => 10
)
)
Program 2:
<?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); ?> |
Output:
SplDoublyLinkedList Object
(
[flags:SplDoublyLinkedList:private] => 0
[dllist:SplDoublyLinkedList:private] => Array
(
[0] => 30
[1] => 20
[2] => 30
[3] => Geeks
[4] => G
)
)
Reference: https://www.php.net/manual/en/spldoublylinkedlist.add.php
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