PHP中多态,抽象类,接口,

小例子:

需求:公司定义一个接口让我们开发功能

　　usb.interface.php:　

 <?php
 interface USB{

     public function run();
 }

　　　　store.class.php:

 <?php
 include_once("./usb.interface.php");
 class store implements USB{

     public function run(){
         $this -> initialize();
     }

     private function initialize(){
         echo "store running ..";
     }
 }

　　mouse.class.php:

 <?php
 include_once("./usb.interface.php");
 class mouse implements USB{

     public function run(){
         $this -> init();
     }

     public function init(){
         echo "mouse running ...";
     }
 }

　　key.class.php:

<?php
include_once("./usb.interface.php");
class key implements USB{

    public function run(){
        $this -> init();
    }

    public function init(){
        echo "key running ..";
    }
}

使用:computer.class.php

<?php
include("./mouse.class.php");
include("./store.class.php");
include("./key.class.php");

class computer{

    public function useUSB($obj){
        $obj -> run();
    }
}

$computer = new computer();

$computer -> useUSB(new mouse());
echo "<hr />";
$computer -> useUSB(new store());
echo "<hr />";
$computer -> useUSB(new key());