PHP | Ds\Deque rotate() Function

The Ds\Deque::rotate() function is an inbuilt function in PHP which is used to rotate the elements of Deque by the given number of rotations.

Syntax:

public Ds\Deque::rotate( $rotations ) : void

Parameters: This function accepts single parameter $rotations which holds the number of rotation of the elements in Deque is to be rotated.

Return value: This function does not return any value.

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

Program 1:

<?php

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

echo("Elements of Deque\n");

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

// Rotating the deque by 2 positions
$deck->rotate(2);

echo("Rotated Deque\n");

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

?>

Output:

Elements of Deque
Ds\Deque Object
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
)
Rotated Deque
Ds\Deque Object
(
    [0] => 3
    [1] => 4
    [2] => 5
    [3] => 6
    [4] => 1
    [5] => 2
)

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);

// Rotating the deque by 2 positions
$deck->rotate(2);

echo("Rotated Deque\n");

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

?>

Output:

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

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