PHP | Ds\Deque clear() Function

The Ds\Deque::clear() function is an inbuilt function in PHP which is used to clear the Deque by removing all elements from the Deque.

Syntax:

public Ds\Deque::clear( void ) : void

Parameters: This function does not accepts any parameter.

Return Value: This function does not return any Value.

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

Program 1:

<?php

// Declare deque of default size
$deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);

echo("Elements in the deck:\n");

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

// Use clear() function to clear the deque
$deck->clear();

// Display the deque
print_r($deck);

?>

Output:

Elements in the deck:
Ds\Deque Object
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
)
Ds\Deque Object
(
)

Program 2:

<?php

// Declare deque of default size
$deck = new \Ds\Deque(["geeks", "for", "geeks"]);

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

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

// Use clear() function to clear the deque
$deck->clear();

echo("Alter clearing the elements\n");
// Display the deque
print_r($deck);

?>

Output:

Elements in the Deque
Ds\Deque Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)
Alter clearing the elements
Ds\Deque Object
(
)

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