Home/ Manual/ ds / deque/ Ds\Deque::apply

Ds\Deque::apply

PHP function Edit on GitHub ✎

(PECL ds >= 1.0.0)

Updates all values by applying a callback function to each value

Description

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.

Void

php

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

print_r($deque);
?>

The above example will output something similar to:

output

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

Source: reference/ds/ds/deque/apply.xml · from the official PHP manual (php/doc-en)