如何从命名空间PHP调用全局函数类 [英] how to call global functions classes from namespace PHP

问题描述

有什么方法可以避免使用如此频繁的反斜杠吗?

Is there any way how to avoid to using so often backslash ?

现在，如果我使用命名空间并在其中调用全局名称，则必须使用反斜杠:

Now if i'm using namespace and calling something global inside it i have to use backslash:

namespace foo;
$a = new \my\name(); // instantiates "my\name" class
echo \strlen('hi'); // calls function "strlen"
$a = \INI_ALL; // $a is set to the value of constant "INI_ALL"

在那种情况下，名称空间中的代码变得非常丑陋，有什么方法可以避免这种情况?

in that case code inside namespace become really ugly, is there any way how to avoid that situation ???

该示例取自以下网址: http://www. php.net/manual/en/language.namespaces.faq.php

The example was taken from that url: http://www.php.net/manual/en/language.namespaces.faq.php

但是我的问题是，如果我需要从命名空间中调用一些内置类，那么我必须在名称前使用反斜杠，我可以以某种方式避免它吗?

But my problem in that, if I need call some built in class from namespace i have to use backslash in front of the name, can I somehow avoid it ?

推荐答案

全局名称空间中的常量和函数不必加反斜杠. PHP将自己退回到全局名称空间. PHP手册中有一整章对此进行了解释:

constants and functions from the global namespace do not have to be prepended with a backslash. PHP will fallback to the global namespace for those on it's own. There is a whole chapter in the PHP manual explaining this:

• 使用名称空间:后退到全局函数/常量

在名称空间中，当PHP在类名称，函数或常量上下文中遇到不合格的名称时，它将以不同的优先级来解析这些名称.类名称始终解析为当前名称空间名称. […]对于函数和常量，如果没有命名空间的函数或常量，PHP将退回到全局函数或常量.

Inside a namespace, when PHP encounters a unqualified Name in a class name, function or constant context, it resolves these with different priorities. Class names always resolve to the current namespace name. […] For functions and constants, PHP will fall back to global functions or constants if a namespaced function or constant does not exist.

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