array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'ds-deque.apply.php', 1 => 'Ds\\Deque::apply', 2 => 'Updates all values by applying a callback function to each value', ), 'up' => array ( 0 => 'class.ds-deque.php', 1 => 'Ds\\Deque', ), 'prev' => array ( 0 => 'ds-deque.allocate.php', 1 => 'Ds\\Deque::allocate', ), 'next' => array ( 0 => 'ds-deque.capacity.php', 1 => 'Ds\\Deque::capacity', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'reference/ds/ds/deque/apply.xml', ), 'history' => array ( ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); contributors($setup); ?>

Ds\Deque::apply

(PECL ds >= 1.0.0)

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

说明

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

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

参数

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.

返回值

没有返回值。

示例

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
)