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php接口与接口引用的深入解析

Jun 13, 2016 am 11:42 AM
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1、接口的介绍与创建 
关键字 :interface 
2、接口的引用与规范 
关键字 :implements 
接口:一种成员属性全部为抽象的特殊抽象类,在程序中同为规范的作用 
1、类中全部为抽象方法 
2、抽象方法前不用加abstract 
3、接口抽象方法属性为public 
4、成员属性必须为常量 

抽象: 
1、类中至少有一个抽象方法 
2、抽象方法前需加abstract 

共同点: 
1、本身都不能被实例化,必须被继承或者引用 
2、继承或者引用后,需要把所有抽象方法重载方可使用 
接口有自己的创建关键字:interface 与普通类的创建类似 

复制代码 代码如下:


interface demo { 
const NAME="名字"; 
function Fun1();//对象方法全部为抽象方法,前面无须加adstract
function Fun2(); 


接口可以使用关键字:implements 多个引用并用逗号 , 分开. 
1、普通类引用接口例子: 

复制代码 代码如下:


class mypc implements demo , demo2 , demo3{ 
…… 


2、抽象类引用接口例子: 

复制代码 代码如下:


abstract class mypc implements demo , demo2 , demo3{ 
…… 


3、继承父类引用接口并存例子: 

复制代码 代码如下:


class mypc extends root implements demo , demo2 , demo3{ 
…… 


4、接口与接口继承: 

复制代码 代码如下:


interface demo3 extends demo{ 
…… 

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