php单例对象模式
假设我们需要写一个类用来操作数据库，并同时满足以下要求：
①SqlHelper类只能有一个实例（不能多）
②SqlHelper类必须能够自行创建这个实例
③必须自行向整个系统提供这个实例,换句话说：多个对象共享一块内存区域，比如，对象A设置了某些属性值，则对象B,C也可以访问这些属性值（结尾的例子很好的说明了这个问题）
?转自：php?单例模式?-?神马?-?云代码空间?http://yuncode.net/article/a_524a37fc4bfb716
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