PHP SplDoublyLinkedList unshift() Function
Last Updated :
23 Jun, 2023
The SplDoublyLinkedList::unshift() function is an inbuilt function in PHP which is used to add the element at the beginning of a doubly linked list.
Syntax:
void SplDoublyLinkedList::unshift( $value )
Parameters: This function accepts a single parameter $value which is used to unshift the value in a doubly linked list.
Return Value: It does not return any value.
Below programs illustrate the SplDoublyLinkedList::unshift() function in PHP:
Program 1:
<?php
$list = new \SplDoublyLinkedList;
$list ->add(0, 30);
$list ->add(1, 20);
$list ->add(2, 30);
$list ->add(3, "Geeks" );
$list ->add(4, 'G' );
$list ->unshift( "GeeksforGeeks" );
print_r( $list );
?>
|
Output:
SplDoublyLinkedList Object
(
[flags:SplDoublyLinkedList:private] => 0
[dllist:SplDoublyLinkedList:private] => Array
(
[0] => GeeksforGeeks
[1] => 30
[2] => 20
[3] => 30
[4] => Geeks
[5] => G
)
)
Program 2:
<?php
$list = new \SplDoublyLinkedList();
$list ->push(1);
$list ->push(2);
$list ->push(3);
$list ->push(8);
$list ->push(5);
$list ->unshift( "Geeks" );
print_r( $list );
?>
|
Output:
SplDoublyLinkedList Object
(
[flags:SplDoublyLinkedList:private] => 0
[dllist:SplDoublyLinkedList:private] => Array
(
[0] => Geeks
[1] => 1
[2] => 2
[3] => 3
[4] => 8
[5] => 5
)
)
Reference: https://www.php.net/manual/en/spldoublylinkedlist.unshift.php
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