(PECL ds >= 1.0.0)
Ds\Deque::rotate — Rotates the deque by a given number of rotations.
Rotates the deque by a given number of rotations, which is equivalent to successively calling
$deque->push($deque->shift()) if the number of rotations is positive, or
$deque->unshift($deque->pop()) if negative.
The number of times the deque should be rotated.
値を返しません。. The deque of the current instance will be rotated.
例1 Ds\Deque::rotate() example
$deque = new \Ds\Deque(["a", "b", "c", "d"]);
$deque->rotate(1); // "a" is shifted, then pushed.
$deque->rotate(2); // "b" and "c" are both shifted, the pushed.
(  => b  => c  => d  => a ) Ds\Deque Object (  => d  => a  => b  => c )