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    Ds\Vector::apply

    (PECL ds >= 1.0.0)

    Ds\Vector::apply — Updates all values by applying a callback function to each value

    说明

    public Ds\Vector::apply(callable $callback): void

    Updates all values by applying a callback function to each value in the vector.

    参数

    callback

    callback(mixed $value): mixed

    A callable to apply to each value in the vector.

    The callback should return what the value should be replaced by.

    返回值

    没有返回值。

    示例

    示例 #1 Ds\Vector::apply() example

    <?php
    $vector     = new \Ds\Vector([1, 2, 3]);
    $vector->apply(function($value) { return $value * 2; });

    print_r($vector);
    ?>

    以上示例的输出类似于：

    Ds\Vector Object
(
    [0] => 2
    [1] => 4
    [2] => 6
)
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