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类的引入，引入

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Release： 2016-06-13 08:42:21
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类的引入，引入

类的引入

    一个类会单独封装在一个独立的文件中。

类的实例时，类的结构的定义，必须先位于内存中。才可以实例化对象

手动引入：

自动引入：

    当实例化一个类的对象时，由PHP的自动执行机制帮我们引入此类文件。

魔术函数

    __autoload();        自动加载

提示：类名、类文件的名，类文件所在的目录名

作业：自行模拟规则的实现不同目录的类，在同一个文件中进行自动加载

Related labels：
。 Memory definition Example introduce document hour independent of kind structure
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