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());