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PHP面向对象的基本学习
什么是对象

世间万物皆对象(可以是可见之物或者一些抽象的概念等)


对象的基本组成
1、对象的组成元素(属性)
2、对象的行为(方法)

对象的特点:
1、每一个对象都是独一无二
2、对象是一个特定事物,他的职能是完成特定功能,
3、对象可以重复使用

为什么面向对象
1、对象的描述方式更加贴近真实世界,有利于大型业务的理解

面向对象的实质
1、面向对象就是把生活中要解决的问题都用对象的方式进行存储(属性、方法)
2、对象与对象之间通过方法进行的调用完成互动

面向对象的基本思路
第一步:识别对象
第二步:识别对象的属性
第三步:识别对象的行为

面向对象的基本原则
1、对象内部是高内聚的
2、对象对外是低耦合的
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