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php中类的继承

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Release： 2016-06-23 13:22:53
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1、子类继承父类用extends关键字

2、子类只能继承自一个父类，但父类可以继承自另一个类

3、继承时，可以继承父类的公共/保护的属性和方法，不能继承私有的属性和方法

4、子类中，可以声明与父类同名的属性和方法进行覆盖，但继承的权限只能是相同或者越来越宽松，不能越来越严格，比如父类中声明protected $a,则子类中不能声明private $a,只能是用public或者protected

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