Summary 87 Summary In this chapter, you ve learned
90 Chapter 3 Application Design: A Real-Life Example Many of the boxed notes in this chapter contain remarks about techniques common to application design that you should memorize and try to use directly on the suggested example (or phpChat in general), and indirectly on your next project. Note: Another, more theoretical but shorter discussion about application design can be found in Chapter 7, Cutting-Edge Applications. Project Overview When designing an application, you start with the idea of what the application is supposed to do. In the case of phpChat, the application is supposed to provide a browser-based chat service. The chat should have the following features: n Real-time chat. No deferred relaying of messages and no refreshes. n No client-side programming. The browser should be confronted only with pure HTML (and eventually some JavaScript). n Networkable. It should be possible to link chat boxes. n Generic. Make as few assumptions about the target systems as possible and introduce as few requirements as possible. n No design enforcements. Separation of code and page layout. n Easy to use and administer. n Unlimited number of clients and chat rooms. Once you ve gotten this far and know what your application is supposed to do, you have to evaluate the concept and create a more detailed overview of how the application should be laid out. Take the time to write down all the requirements. It helps a lot, especially as a reminder later on.
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