laravel 在 PHP 中 ClassName::class 是什么意思？
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What does ClassName::class mean in PHP?
提问by yinwei
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.
当我阅读用 Laravel 框架编写的代码时，我看到了很多ClassName::class. 修饰符是什么意思::class？这是 Laravel 或 PHP 的特性吗？我已经搜索过，但找不到文档。
回答by DeDee
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 ClassNameclass by using
ClassName::class. This is particularly useful with namespaced classes.
自 PHP 5.5 起，class 关键字也用于类名解析。你可以得到包含的完全限定名称的字符串类名使用类
ClassName::class。这对于命名空间类特别有用。
For example
例如
namespace MyProject;
class Alpha{ }
namespace MyOtherProject;
class Beta{ }
echo Alpha::class; // displays: MyProject\Alpha
echo Beta::class; // displays: MyOtherProject\Beta
回答by Soliman Mahmoud Soliman
It just returns the class name with namespace! 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.
它只返回带有命名空间的类名！自 PHP 5.5 起，class 关键字也用于类名解析。您可以使用 ClassName::class 获取包含 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。
namespace NS {
class ClassName {
}
echo ClassName::class;
}
The above example will output:
上面的例子将输出：
NS\ClassName
