<?php

interface icar{

    function Run();

}

class daben implements icar{

    public function Run()

    {

        echo "奔驰汽车" ;

    }

}

class aodi implements icar{

    public function Run() {

        echo "奥迪汽车";

    }

}

abstract class road{

    public $icar;

    abstract function Run ();

} 

class gaosu extends road{

    function Run (){

        $this->icar->Run();

        echo  ":在告诉路上行驶";

    }

}

class xiaolu extends road {

    function Run () {

        $this->icar->Run();

        echo  ":在小路路上行驶";

    }

}

$gaosuroad = new gaosu();

$gaosuroad->icar= new aodi();

$gaosuroad->run();

$gaosuroad = new xiaolu();

$gaosuroad->icar= new daben();

$gaosuroad->run();