如果PHP中的(\ false)(是，带反斜杠)是什么意思? [英] What does mean if (\false) (yes, with backslash) in PHP?

问题描述

今天早上，我收到通知，新的 Twig_Extensions 版本已经发布！是的！

This morning, I've been notified that a new Twig_Extensions release is available! Yay!

在将其集成到 twigfiddle 之前，我想看看 class_alias 函数为名称空间添加支持，然后添加仅包含旧版的PSR-4对应类.

Before integrating it to twigfiddle, I wanted to see changes. This is mainly adding support to namespaces using class_alias function, and then add PSR-4 correspoding classes that just include the legacy one.

但是每个新的(命名空间)类都是这样实现的:

But each new (namespaced) classes are implemented like this:

<?php

namespace Twig\Extensions;

require __DIR__.'/../lib/Twig/Extensions/Extension/Text.php';

if (\false) {
    class TextExtension extends \Twig_Extensions_Extension_Text
    {
    }
}

此表示法是什么意思?

推荐答案

这表示它使用的是全局命名空间中定义的false..

It means it's using the false defined in the global namespace..

经过一番研究，结果发现剩下的答案毫无意义……我发誓您能够在某个时间点用PHP做到这一点.

After a bit of research it turns out the rest of this answer is nonesense... I could swear you were able to do this in PHP at one point in time.

我认为这是可以解决的情况

I think this is get around the situation where

<?php
namespace whywouldyoudothis;

false = true;
?>

我从未见过有人为此编写过代码，但这就是我的初衷.

I have never ever seen anyone code for this but that's what springs to mind.

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