PHP SplDoublyLinkedList add() Function

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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