(PECL ds >= 1.0.0)
Ds\Deque::rotate — Rotates the deque by a given number of rotations
$rotations
) : void
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.
rotationsThe number of times the deque should be rotated.
没有返回值。. The deque of the current instance will be rotated.
Example #1 Ds\Deque::rotate() example
<?php
$deque = new \Ds\Deque(["a", "b", "c", "d"]);
$deque->rotate(1); // "a" is shifted, then pushed.
print_r($deque);
$deque->rotate(2); // "b" and "c" are both shifted, the pushed.
print_r($deque);
?>
以上例程的输出类似于：
(
[0] => b
[1] => c
[2] => d
[3] => a
)
Ds\Deque Object
(
[0] => d
[1] => a
[2] => b
[3] => c
)