For more information about writing more maintainable PHP by using object-oriented programming concepts and design patterns, see Resources.

有关如何用面向对象编程的概念和设计模式编写更易于维护的 PHP 的详细信息，请参见 参考资料。

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When PHP V5 was released in 2004, it was a giant leap forward compared to what PHP V4 provided in regards to object-oriented programming (OOP) and design.

与 PHP V4 提供的特性相比，2004 年发布的 PHP V5 在面向对象编程（OOP）和设计方面向前迈出了很大的一步。

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Due to the wonders of object-oriented programming and the principles of design by interface, you can simply replace your original ContactDAOMock with the new ContactJdoDAO.

通过面向对象的编程和接口设计原则，您只需使用新的ContactJdoDAO替代原始的ContactDAOMock。

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