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php单例对象形式

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Release： 2016-06-13 12:34:04
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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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