PHP | SplDoublyLinkedList top() Function

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:

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<?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());
  
?> 

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Output:

string(1) "G"

Program 2:

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<?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());
  
?> 

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Output:

int(5)

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



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