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2019.11.29抽象类与接口--php培训第九期线上班
涤尘
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抽象类与接口

总结：abstract抽象类定义词，在类中有一个方法是抽象方法的，本类必须声明为抽象类，抽象类不能实例化，但可被继承，由其子类继承，其本身方法可在子类中实现，并且子类的可见性要高于父类！interface接口关键词，implements类实现接口的关键字，接口中允许出现方法与类常量，但接口中的方法可见性必须是Public，接口简单可理解为老报要求，写在一个文件上，下面的员工必须按照老报文件要求行事情！

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