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PHP | SplDoublyLinkedList prev() Function
  • Last Updated : 23 Aug, 2019

The SplDoublyLinkedList::prev() function is an inbuilt function in PHP which is used to move to the previous entry.

Syntax:

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:
SplDoublyLinkedList Object
(
    [flags:SplDoublyLinkedList:private] => 0
    [dllist:SplDoublyLinkedList:private] => Array
        (
            [0] => 30
            [1] => 20
            [2] => 30
            [3] => Geeks
            [4] => G
        )

)

Program 2:




<?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:
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)
  }
}

Reference: https://www.php.net/manual/en/spldoublylinkedlist.prev.php

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