PHP中ClassName :: class的含义是什么? [英] What does ClassName::class mean in PHP?

问题描述

当我阅读用Laravel框架编写的代码时，我看到了ClassName::class的许多用法.修饰符::class是什么意思?这是Laravel或PHP的功能吗?我已经搜索过，但是找不到文档.

When I read code written in the Laravel framework, I see a lot of uses of ClassName::class. What does is the meaning of the modifier ::class? Is this a feature of Laravel or PHP? I've searched but been unable to find documentation.

推荐答案

自PHP 5.5起，class关键字也用于类名解析.您可以使用ClassName::class获得包含 ClassName 类的完全限定名称的字符串.这对于命名空间类特别有用.

Since PHP 5.5, the class keyword is also used for class name resolution. You can get a string containing the fully qualified name of the ClassName class by using ClassName::class. This is particularly useful with namespaced classes.

例如

namespace MyProject;
class Alpha{ }

namespace MyOtherProject;
class Beta{ }

echo Alpha::class; // displays: MyProject\Alpha
echo Beta::class; // displays: MyOtherProject\Beta

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