反射是运行时发现的关于给定类或接口的信息，如方法、字段和构造函数。

Reflection is the runtime discovery of information, such as methods, fields, and constructors, about a given class or interface.

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PHP 有一个有用的反射 API，它允许我们对类、接口、函数和方法执行反向工程。

PHP has a useful reflection API, which allows us to reverse-engineer classes, interfaces, functions, and methods.

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标注作为修饰符，可以添加到包、类、接口、方法或字段声明中。

Annotations serve as modifiers that can be added to packages, classes, interfaces, methods, or field declarations.

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