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PHP SplDoublyLinkedList isEmpty() Function

Last Updated : 23 Jun, 2023
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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 
<?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 
<?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

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