PHP | Ds\Deque pop() Function

The Ds\Deque::pop() function is an inbuilt function in PHP which is used to remove the last element from Deque (if Deque is not empty) and return it. If Deque is empty then it throws an exception.

Syntax:

public Ds\Deque::pop( void ) : mixed

Parameters: This function does not accept any parameter.

Return Value: This function returns the removed last element from the Deque.

Below programs illustrate the Ds\Deque::pop() function in PHP:

Program 1:

<?php

// Declare a deque
$deck = new \Ds\Deque([10, 20, 30, 40, 50, 60]);

echo("Elements of Deque\n");

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

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

// Use pop() function to removing last
// element from Deque and Display it
print_r($deck->pop());

echo("\nElements of Deque\n");

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

?>

Output:

Elements of Deque
Ds\Deque Object
(
    [0] => 10
    [1] => 20
    [2] => 30
    [3] => 40
    [4] => 50
    [5] => 60
)

Last element of deque: 60
Elements of Deque
Ds\Deque Object
(
    [0] => 10
    [1] => 20
    [2] => 30
    [3] => 40
    [4] => 50
)

Program 2:

<?php

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

echo("Elements of Deque\n");

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

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

// Use pop() function to removing last
// element from Deque and Display it
print_r($deck->pop());

echo("\nElements of Deque\n");

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

?>

Output:

Elements of Deque
Ds\Deque Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
    [3] => practice
)

Last element of deque: practice
Elements of Deque
Ds\Deque Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)

Reference: http://php.net/manual/en/ds-deque.pop.php