protected 、public、 static 做PHP的程序员对这三个属性应该都不会陌生。
今天小书生针对 protected 的属性来详解下使用方法和实用场景。
首先我们在一个类里面，新手看好了，是类里面。定义一个为protected 的私有变量是受保护的
说白了就是其他地方那怕 实例化 也不能对这个定义protected 的变量进行更改，只能内部定义和实用
那么说说怎么使用这个定义为protected 属性的变量或者方法：
在使用该属性定义的变量时 要用$this->变量名 这样的方式去使用
如果你引入一个文件 但是该文件定义了protected的属性变量的时候 一定要实例化该类
然后在类的内部去$this->变量 调用该方法或者属性，对这块不理解的 最好收藏下该文章
方便以后阅读。
如果有错，欢迎大神留言指点，谢谢！
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