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    Ds\Deque::rotate

    (PECL ds >= 1.0.0)

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

    説明

    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.

    パラメータ

    rotations

    The number of times the deque should be rotated.

    戻り値

    値を返しません。. The deque of the current instance will be rotated.

    例

    例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);
    ?>

    上の例の出力は、 たとえば以下のようになります。

    (
    [0] => b
    [1] => c
    [2] => d
    [3] => a
)
Ds\Deque Object
(
    [0] => d
    [1] => a
    [2] => b
    [3] => c
)

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