php interface implements multibus

<?php
/*
 * Created on 2009-10-28
 * 分子如梦o(╯□╰)o
 * To change the template for this generated file go to
 * Window - Preferences - PHPeclipse - PHP - Code Templates
 */
 interface pusb{
    function verson();
    function type();
 }
 class mouse implements pusb{
     function verson(){
        echo "USB 2.0版本;";
    }
     function type(){
        echo "鼠标<br>";
    }
 }
 class video implements pusb{
    function verson()
    {
     echo "USB 1.0版本;";
    }
    function type(){
        echo "视频";
    }
 }
class myPC{
    function output($that){
        $that->verson();
        $that->type();
    }
}
$p = new myPc();
$mouse = new mouse();
$video = new video();
$p->output($mouse);
$p->output($video);
if($p instanceof myPc){
 echo "<BR>YES.myPc";
}
?>