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