Ds\Deque::unshift

    (PECL ds >= 1.0.0)

    Ds\Deque::unshift — Adds values to the front of the deque

    Description

    public Ds\Deque::unshift(mixed $values = ?): void

    Adds values to the front of the deque, moving all the current values forward to make room for the new values.

    Parameters

    values

    The values to add to the front of the deque.

    Note:

    Multiple values will be added in the same order that they are passed.

    Return Values

    No value is returned.

    Examples

    Example #1 Ds\Deque::unshift() example

    <?php
    $deque     = new \Ds\Deque([1, 2, 3]);

    $deque->unshift("a");
    $deque->unshift("b", "c");

    print_r($deque);
    ?>

    The above example will output something similar to:

    Ds\Deque Object
(
    [0] => b
    [1] => c
    [2] => a
    [3] => 1
    [4] => 2
    [5] => 3
)

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    User Contributed Notes 1 note

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    1
    hugo at fc dot up dot pt
    4 years ago
    Where the documentation says "moving all the current values forward", while it sounds like the complexity would be O(N), I checked the code at https://github.com/php-ds/ext-ds/blob/master/src/ds/ds_deque.c#L366 and it is in fact O(1) for each element
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