The SplDoublyLinkedList::prev() function is an inbuilt function in PHP which is used to move to the previous entry.
Syntax:
php
php
void SplDoublyLinkedList::prev( void )Parameters: This function does not accepts any parameters. Return Value: It does not return any value. Below programs illustrate the SplDoublyLinkedList::prev() 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, 30);
$list->add(1, 20);
$list->add(2, 30);
$list->add(3, "Geeks");
$list->add(4, 'G');
// Use SplDoublyLinkedList::prev() function
// to move to previous entry
$list->prev();
// Display doubly linked list
print_r($list);
?>
Output:
Program 2:
SplDoublyLinkedList Object
(
[flags:SplDoublyLinkedList:private] => 0
[dllist:SplDoublyLinkedList:private] => Array
(
[0] => 30
[1] => 20
[2] => 30
[3] => Geeks
[4] => G
)
)
<?php
// Declare an empty SplDoublyLinkedList
$list = new \SplDoublyLinkedList();
// Use SplDoublyLinkedList::push() function to
// add elements to the SplDoublyLinkedList
$list->push(1);
$list->push(2);
$list->push(3);
$list->push(8);
$list->push(5);
// Use SplDoublyLinkedList::prev() function
// to move to previous entry
$list->prev();
// Display doubly linked list
var_dump($list);
?>
Output:
Reference: https://www.php.net/manual/en/spldoublylinkedlist.prev.php
object(SplDoublyLinkedList)#1 (2) {
["flags":"SplDoublyLinkedList":private]=>
int(0)
["dllist":"SplDoublyLinkedList":private]=>
array(5) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
[3]=>
int(8)
[4]=>
int(5)
}
}