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 $deck = new \Ds\Deque(["neveropen", "for", "neveropen", "practice"]);   echo("Elements of Deque\n");   // Display the Deque elements print_r($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] => neveropen
[1] => for
[2] => neveropen
[3] => practice
)
Rotated Deque
Ds\Deque Object
(
[0] => neveropen
[1] => practice
[2] => neveropen
[3] => for
)
Reference: http://php.net/manual/en/ds-deque.rotate.php
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