oop - 关于php中的private
最近学校在学习网站开发,讲到php,研究php中的面向对象发现一个问题,就是说设置对于实现过__get()
和 __set()
的类,个人感觉private
的属性和不加private
的属性就没区别了,那private
有什么用?
回复内容:
最近学校在学习网站开发,讲到php,研究php中的面向对象发现一个问题,就是说设置对于实现过__get()
和 __set()
的类,个人感觉private
的属性和不加private
的属性就没区别了,那private
有什么用?
__get和set 可以实现当set一个不存在的属性就放进一个数组里面而不是属性里面这样的功能。
再说了,private是将类自身属性定义级别的方法,并不存在说为什么要设置,有什么用的问题啊
首先说明我们应该少用魔术方法,魔术方法相对耗资源。
然后你这个问题可以类比为“有了string为什么还要int”?效果的也一样,为何不废除int呢?
这是程序设计的问题。
为什么要有private,因为要保护对象属性不被外部随意的修改。
那么为什么要有 public function get(); public function set(); 因为业务逻辑又要求不能完全封闭,希望对外能够提供属性内容,那么就通过 set(),get() 方法来提供了。

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