The SplDoublyLinkedList::isEmpty() function is an inbuilt function in PHP which is used to check whether the doubly linked list is empty or not.
Syntax:
bool SplDoublyLinkedList::isEmpty( void )
Parameters: This function does not accepts any parameters.
Return Value: This function returns True if doubly linked list is empty, False otherwise.
Below programs illustrate the SplDoublyLinkedList::isEmpty() function in PHP:
Program 1:
<?php // Declare an empty SplDoublyLinkedList $list = new \SplDoublyLinkedList;
// Use isEmpty function $res = $list ->isEmpty();
var_dump( $res );
// 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 isEmpty function $res = $list ->isEmpty();
var_dump( $res );
?> |
Output:
bool(true) bool(false)
Program 2:
<?php // Declare an empty SplDoublyLinkedList $list = new \SplDoublyLinkedList;
// Use isEmpty function $res = $list ->isEmpty();
var_dump( $res );
// 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 isEmpty function $res = $list ->isEmpty();
var_dump( $res );
?> |
Output:
bool(true) bool(false)
Reference: https://www.php.net/manual/en/spldoublylinkedlist.isempty.php