PHP SplDoublyLinkedList bottom() Function

The SplDoublyLinkedList::bottom() function is an inbuilt function in PHP which is used to peek the value of node from the beginning of the doubly linked list.

Syntax:

mixed SplDoublyLinkedList::bottom( void )

Parameters: It does not accepts any parameter.

Return Value: It returns the value of first node in doubly linked list.

Below programs illustrate the SplDoublyLinkedList::bottom() function in PHP:

Program 1:

<?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 bottom() function
$val = $list->bottom();

// Display result
print_r($val);

?>

Output:

1

Program 2:

<?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 bottom() function
$val = $list->bottom();

// Display result
print_r($val);

?>

Output:

30

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