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面向对象必看的9大重点

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Jun 13, 2016 am 10:38 AM

onenosharedbigobjectencapsulationemphasizeofprogramstructureelementFor

一、面向对象的要素
1. 抽象性 , 2. 封装性，3.共享性，4. 强调对象结构而不是程序结构

面向对象的三大特点（封装，继承，多态）缺一不可

二、class MyPc{
public $name;   —>成员属性(可以理解为自定义变量)
var $price;
function vod() { —>成员方法（可以里金额为自定义函数）
return "bkJia视频教程";
   }
}
$pc1 = new MyPc(); —>实例化类
$pc1->name;         —>使用 -> 访问对象内容

三、OOp object Oriented Program 解释：程序向导开发

四、$this关键字是用来访问当前对象中的对象属性和对象方法的系统变量

五、析构函数：能够在对象释放时自动被调用的方法被称为析构函数

六、封装关键字：public，protected，private
    封装相关函数：__set() , __get()

七、public 表示全局，类内部外部子类都可以访问；
    protected表示受保护的，只有本类或子类或父类中可以访问；
    private表示私有的，只有本类内部可以使用；

八、继承关键字：extends     单一继承

九、基类方法重载和父类方法访问   重载方法基类名：：方法名称

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