PHP | SplDoublyLinkedList count() function

The SplDoublyLinkedList::count() function is an inbuilt function in PHP which is used to count the number of elements present in a doubly linked list.

Syntax:

int SplDoublyLinkedList::count( void )

Parameters: It does not contain any parameter.

Return Value: It returns the number of elements present in doubly linked list.

Below programs illustrate the SplDoublyLinkedList::count() 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::count() function
// to return number of elements
print_r($list->count());

?>

Output:

5

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::count() function
// to return number of elements
print_r($list->count());

?>

Output:

5

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