比如数据库连接池就是单例设计模式的一个例子：我们一般不想让应用程序具有连接池类的多个资源密集型实例。
An example use case for a singleton would be a database connection pool: you don't want your application to have multiple resource-intensive instances of a connection pool class.
然后展示了PHPV5.3的LSB特性，并给出了单例和活动记录设计模式。
Then it shows how PHP V5.3's LSB feature resolves those issues, while showing implementations of the singleton and active record design patterns.
单例模式可能是最常用的OOP设计模式之一了；它限制了一个类的对象实例数只能为1。
The singleton pattern is probably one of the most often used OOP design patterns; it restricts the number of object instances of a class to one.
单例模式是一种非常有用的设计模式，它允许你的类对外只提供一个实例，但是常犯的错误在于不止一个实例被创建。
The singleton is a useful design pattern for allowing only one instance of your class, but common mistakes can inadvertently allow more than one instance to be created.
单例、生成器和工厂方法设计模式被视为是创建型的模式，因它们可协助对象的构建。
The singleton, builder, and factory method design patterns are considered creational patterns, as they assist in the construction of objects.
单例、生成器和工厂方法设计模式被视为是创建型的模式，因它们可协助对象的构建。
The singleton, builder, and factory method design patterns are considered creational patterns, as they assist in the construction of objects.
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