在PHP中，带有两个这样的括号的(数组)是什么意思? [英] What does (array) with two parentheses like this mean in PHP?

问题描述

最近我一直在阅读一些代码，并且遇到了一些实例，在这些实例中，开发人员会将括号括起来，如下例所示.

I've been reading some code recently and I've come across a few instances where the developer would wrap parentheses around like following example.

有此功能:

foreach ((array) $middleware as $m) {
    $this->middleware[] = [
    'middleware' => $m,
            'options' => &$options,
    ];
}

在每次检查中，都有一个带有括号的数组(array)，这是什么意思.

In the for each check there's array (array) with parentheses around, what do these mean.

或者有人可以指导我阅读文档，以便我阅读此问题. 预先感谢.

Or can someone guide me to a doc where I can read up on this matter. Thanks in advance.

推荐答案

这称为它强制$ middleware为数组数据类型.一些例子:

It forces $middleware to an array data type. Some examples:

(array) [1,2] // [1,2]
(array) 1 // [1]
(array) stdClass{hello: world} // [hello => world]  (object to array pseudocode)

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