thinkphp ftp上传文件问题

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'] . "|";                            $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 . "|";                        }                    }                }            }            $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：<form action="album_add" method="post" enctype="multipart/form-data">    <table width="80%" height="100%" id="album_table_add">        <tr>            <td>相册标题：</td>            <td><input type="text" name="album_title_add" id="album_title_add" size="50"/></td>        </tr>        <tr>            <td>相册封面：</td>            <td>                <input type="file" name="album_cover_add" id="album_cover_add" value=""/>            </td>        </tr>        <tr>            <td>上传图片：</td>            <td>                <input type="file" name="album_images_add_3" id="album_images_add_3" value=""/>                <input type="button" name="album_rows_add_3" id="album_rows_add_3" value="添加" onclick="add_row(3)"/>            </td>        </tr>        <tr>            <td>后台管理封面尺寸：</td>            <td>                宽：<input type="text" name="cover_width" id="cover_width" value="150"/>                高：<input type="text" name="cover_height" id="cover_height" value="150"/>            </td>        </tr>        <tr>            <td>前台首页封面尺寸：</td>            <td>                宽：<input type="text" name="index_cover_width" id="index_cover_width" value="150"/>                高：<input type="text" name="index_cover_height" id="index_cover_height" value="150"/>            </td>        </tr>        <tr>            <td>前台列表尺寸：</td>            <td>                宽：<input type="text" name="list_cover_width" id="list_cover_width" value="150"/>                高：<input type="text" name="list_cover_height" id="list_cover_height" value="150"/>            </td>        </tr>        <tr>            <td>前台详细页尺寸：</td>            <td>                宽：<input type="text" name="detail_cover_width" id="detail_cover_width" value="150"/>                高：<input type="text" name="detail_cover_height" id="detail_cover_height" value="150"/>            </td>        </tr>        <tr>            <td colspan=2>                <input type="submit" id="album_submit_add" name="album_submit_add" value="添加相册" />            </td>        </tr>    </table></form>