Php/docs/ds-sequence.apply

• PHP Manual
• Sequence
• Updates all values by applying a callback function to each value

Ds\Sequence::apply

(PECL ds >= 1.0.0)

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

説明

abstract public Ds\Sequence::apply ( callable $callback ) : void

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

パラメータ

callback

callback ( mixed $value ) : mixed

A callable to apply to each value in the sequence.

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

返り値

値を返しません。

例

例1 Ds\Sequence::apply() example

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

上の例の出力は、 たとえば以下のようになります。

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