It is my true belief that Singleton patterns have been used with far too little thought in most frameworks.

我坚信，在大多数的框架中，使用单例模式时，考虑得都太少了。

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The framework we'll create is a simple 3-tier framework that processes business logic using three patterns: the 3-layer architecture pattern, the Singleton pattern, and the Command pattern.

我们将要建立的是一个简单的3-tier框架，它使用了三种模式处理业务逻辑：3-layer 体系结构模式、 Singleton模式和Command模式。

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Then it shows how PHP V5.3's LSB feature resolves those issues, while showing implementations of the singleton and active record design patterns.

然后展示了 PHP V5.3 的 LSB 特性，并给出了单例和活动记录设计模式。

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