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