thinkphpftp上传文件有关问题

控制器中处理新增相册模块
function album_add() {
        if (!session('?user')) {
            $this->error('无权限操作!', "", 3);
        }
        if (IS_POST) {
            $upload = new \Think\Upload();// 实例化上传类
            $upload->maxSize   =     3145728 ;// 设置附件上传大小
            $upload->exts      =     array('jpg', 'gif', 'png', 'jpeg');// 设置附件上传类型
            $d_root = $_SERVER['DOCUMENT_ROOT'];
            $upload->rootPath  =     $d_root . '/upload/album/'; // 设置附件上传根目录
            $upload->savePath  =     ''; // 设置附件上传（子）目录
            // 上传文件
            $info   =   $upload->upload();
            $images = "";
            $cover_image = "";
            $index_cover = "";

            if(!$info) {// 上传错误提示错误信息
                $this->error($upload->getError());
            } else {
                if (is_array($info)) {
                    foreach($info as $key=>$value) {
                        if (strpos($key,"album_cover_add") !== FALSE) {
                            $cover_image = '/upload/album/' . $value['savepath'] . $value['savename'];
                            $thumb_image_path = '/upload/album/' . $value['savepath'] .'admin_cover/';
                            $image_name = $value['savename'];
                            create_dir("$d_root.$thumb_image_path");
                            $image = new \Think\Image();
                            $image->open("$d_root$cover_image");
                            // 生成一个居中裁剪为150*150的缩略图并保存为thumb.jpg
                            $image->thumb(150, 150,\Think\Image::IMAGE_THUMB_CENTER)->save("$d_root$thumb_image_path$image_name");
                            $admin_cover_path = $thumb_image_path . $image_name;
                        } else {
                            $images .= '/upload/album/' . $value['savepath'] . $value['savename'] . "
------解决思路----------------------
";
                            $images_path = '/upload/album/' . $value['savepath'] . $value['savename'];
                            $index_cover_path = '/upload/album/' . $value['savepath'] . 'index_cover/';
                            $image_name = $value['savename'];
                            create_dir("$d_root.$index_cover_path");
                            $image = new \Think\Image();
                            $image->open("$d_root$images_path");
                            // 生成一个居中裁剪为150*150的缩略图并保存为thumb.jpg
                            $image->thumb(150, 150,\Think\Image::IMAGE_THUMB_CENTER)->save("$d_root$index_cover_path$image_name");
                            $index_cover .= $index_cover_path . $image_name . "
------解决思路----------------------
";
                        }
                    }
                }
            }
            $nowTime = date('y-m-d h:i:s',time());
            $a['title'] = I('post.album_title_add');
            $a['cover_image'] = $admin_cover_path;
            $a['index_cover_image'] = $index_cover;
            $a['images'] = $images;
            $a['add_time'] = $nowTime;
            $a['last_update_time'] = $nowTime;
            $album = M("album");
            $album->create($a);
            $result = $album->add();
            if($result){
                //设置成功后跳转页面的地址，默认的返回页面是$_SERVER['HTTP_REFERER']
                $this->success('相册发布成功!', "album_list", 3);
            } else {
                //错误页面的默认跳转页面是返回前一页，通常不需要设置
                $this->error('相册发布失败!', "", 5);
            }
        } else {
            $this->display("album_add");
        }
    }


页面模板：