Ds\Deque::apply

(PECL ds >= 1.0.0)

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

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

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

callback

callback(mixed $value): mixed

A callable to apply to each value in the deque.

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

没有返回值。

示例 #1 Ds\Deque::apply() example

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

print_r($deque);
?>

以上示例的输出类似于：

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