PHP | Ds\Deque last() Function

Last Updated : 11 Jul, 2025
The Ds\Deque::last() function is an inbuilt function in PHP which is used to return the last element of Deque if Deque is not empty. Syntax: 
public Ds\Deque::last( void ) : mixed
Parameters: This function does not accept any parameter. Return Value: This function returns the last element in the deque if it is not empty. Exception: This function throws UnderflowException if the Deque is empty. Below programs illustrate the Ds\Deque::last() function in PHP: Program 1: PHP 
<?php

// Create a Deque
$deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);

echo("Elements in the deque\n");

// Display the Deque Elements
var_dump($deck);

echo("\nLast element in the deque: ");

// Use last() function to display the 
// last element from the deque
var_dump($deck->last());

?>
Output: 
Elements in the deque
object(Ds\Deque)#1 (6) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  int(5)
  [5]=>
  int(6)
}

Last element in the deque: int(6)
Program 2: PHP 
<?php

// Create a Deque
$deck = new \Ds\Deque(["geeks", "for", "geeks"]);

echo("Elements in the deque\n");

// Display the Deque Elements
print_r($deck);

echo("\nLast element in the deque: ");

// Use last() function to display the 
// last element from the deque
print_r($deck->last());

?>
Output: 
Elements in the deque
Ds\Deque Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)

Last element in the deque: geeks
Reference: https://www.php.net/manual/en/ds-deque.last.php
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