引用:This is part 3 of a multi-part series on the design of a complete application framework written in PHP. In part 1, we covered the basic class structure of the framework and laid out the scope of the project. The second part described methods for managing users and session data. This part describes a practical implementation of page templates and the separation of application logic from the presentation layer.这是PHP框架设计入门系列教程的第三部分。在第一部分，我们已经介绍框架的基础类结构，并展示了项目的大体。第二部分叙述了管理用户和会话数据的一些方法。这一部分，我们
