thinkphp 引入二维码phpqrcode总是报错

public function setGoodsQrcode($url = '', $uid = 0, $id = 0, $type = 'goods', $goods_id = 0, $price = 0, $dir = 'web')
{
    try {
        require './extend/phpqrcode/phpqrcode.php';

        }

}

[ error ] [64]app\base\controller\MyQrcode::setGoodsQrcode(): Failed opening required './extend/phpqrcode/phpqrcode.php' (include_path='.;C:\php\pear')

总是提示错误，这个到底怎么回事

建议用composer引入phpqrcode