Ds\Sequence::apply

(PECL ds >= 1.0.0)

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

说明

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

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

参数

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.

返回值

没有返回值。

范例

示例 #1 Ds\Sequence::apply() example

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

print_r($sequence);
?>

以上例程的输出类似于：

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