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PHP SplDoublyLinkedList top() Function

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The SplDoublyLinkedList::top() function is an inbuilt function in PHP which is used to return the value of last (top) node in a doubly-linked list. Syntax:
mixed SplDoublyLinkedList::top( void )
Parameters: This function does not accepts any parameters. Return Value: It returns the value of last node in a doubly linked list. Below programs illustrate the SplDoublyLinkedList::top() 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 top() function
var_dump($list->top());
  
?> 

                    
Output:
string(1) "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 top() function
var_dump($list->top());
  
?> 

                    
Output:
int(5)
Reference: https://www.php.net/manual/en/spldoublylinkedlist.top.php

Last Updated : 23 Jun, 2023
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