问题不是位于界面，但问题是因你的通用实现使用静态方法和属性。

The problem is not located at the interface, but the problem is because of your generic implementation using static methods and properties.

youdao

上述提到的所有这四个设计模式均使用了静态的属性和方法。

All four of the design patterns mentioned use static attributes and methods.

youdao

PHP V5.3的LS B功能让您可以使用需要静态属性和方法的设计模式。

PHP V5.3's LSB functionality allows you to use design patterns that require the use of static properties and methods.

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