Ds\Deque::rotate

(PECL ds >= 1.0.0)

Ds\Deque::rotate — Rotates the deque by a given number of rotations

说明

public Ds\Deque::rotate ( int $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.

参数

rotations: The number of times the deque should be rotated.

返回值

没有返回值。. The deque of the current instance will be rotated.

范例

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
)