php策略模式的有关问题~下~多谢帮改下下面的代码

studywx(studtq);
$chperson->usewq(xiaoqiang);
$chperson->studywx(studtq);
$amperson=new amperson();
$amperson->studywx(studyw);
$amperson->usewq(xiaoqiang);
$amperson->studywx(qiang);


?>

studywx();
    }
    public function usewq($wq){
        $wq->usewq();
    }
}
class chperson extends  person{
    public function speak(){
        echo "中国人在说话，各路让行!~";
    }
}
class amperson extends  person{
    public function speak(){
        echo "美国人在说，叽叽喳喳!~";
    }
}

interface istudy{
    public function studywx();
}
class studyw implements istudy{
    public function studywx(){
        echo "如来神掌";
    }
}
class studtq implements istudy{
    public function studywx(){
        echo "葵花宝典";
    }
}

interface iwq{
    public function usewq();
}
class jian implements iwq{
    public function usewq(){
        echo "倚天剑";
    }
}
class qiang implements iwq{
    public function usewq(){
        echo "洋枪";
    }
}

$chiness=new chperson();//上来个中国人
$chiness->studywx(new studyw()); //给本如来神掌学
$chiness->usewq(new jian());//给他把倚天剑

$american=new amperson();//上来个美国人
$american->studywx(new studtq());//给本葵花宝典学
$american->usewq(new qiang());//给他个破洋枪