php中使用include 或者require
从一开始接触php，由于项目需求，便一直使用php的框架，自然而言也就一种用着MVC模式 今天有个同学写php用include发现include进的文件中的类无法使用 帮他看了一下，结果发现以前也没有注意的一个问题，在这里分享一下。 php可以使用include和require将一个
从一开始接触php，由于项目需求，便一直使用php的框架，自然而言也就一种用着MVC模式
今天有个同学写php用include发现include进的文件中的类无法使用
帮他看了一下，结果发现以前也没有注意的一个问题，在这里分享一下。
php可以使用include和require将一个文件完全复制到另一个文件的对应位置，就仿若在该位置就有这些代码一样，对于不使用框架实现MVC是很有用的。
他们的区别是使用require如果出错该php文件就会产生致命性错误无法继续解释，而如果使用include，程序会产生警告但会继续解释执行，不会终断。
当然，require和include都有自己的另一个对应版本：include_once 和 require_once
这两个函数的特点是只会在一个php文件中引入同一个文件一次，不会重复引入。
ok，现在来说一下同学出现错误的原因：
*******************
在php中如果引入的文件是一个类，那么该类不能够在该文件的一个类中的方法之外进行实例化和方法调用，必须在类的外部或者一个类的方法的内部进行方法的调用！！
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