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基于已经制作好的pdf和上传到服务器上后，前端只需要传递pdf链接 数组的形式

/**

     *  批量导出pdf

     * @access  public

     * @param   id     分类编号  cat_name分类名称

     * @return  array

     */

    public function actionExportpdf(){

        $ids = Yii::$app->request->post('id')；

        $dcat_id = Yii::$app->request->post('dcat_id');

        if (!$ids) {

            return ['code' => -2, 'msg' => '参数错误'];

        }

        //商品文件属性

        $dataFlie = new \backend\models\MmcDataFile();

        $goodsDataFiles = $dataFlie->getGoodsDataFile($ids);

        $goodsDataFiles= array_filter($goodsDataFiles,function ($v)use($dcat_id){

            if($v['dcat_id']==$dcat_id){

                return TRUE;

            }

        });

        foreach ($goodsDataFiles as $val){

            $url = $val['file_url'];

        }

        ob_end_clean();

        ob_start();

        $file = file_get_contents($url);

        header("Content-type:application/octet-stream");

        $filename = pathinfo($url,PATHINFO_BASENAME);

        header("Content-Disposition:attachment;filename=" . $filename);

        header("Accept-ranges:bytes");

        ob_end_flush();

        exit($file);

    }



//导出图片    基于前端传递图片二维数组链接   把属于二维数组中的一维数组多个图片合并后并下载

    public function actionExportimg()

    {

        $ids = Yii::$app->request->post('id');

        $goodsThumb= Yii::$app->request->post('goods_thumb');

        if (!$ids || !$goodsThumb) {

            return ['code' => -2, 'msg' => '参数错误'];

        }

        if(is_array($goodsThumb)){

            $root =  $_SERVER['DOCUMENT_ROOT'];

            $num = strrpos($root,'/');

            $rootdir = substr($root,0,$num);

            $num = strrpos($rootdir,'/');

            $rootdir = substr($root,0,$num);

            if(count($goodsThumb)<=0){return json_encode(['code'=>-101,'message'=>'未接收到图片','data'=>'']);}

            $editor = Grafika::createEditor();

            $imageBack = Grafika::createBlankImage(1200, count($goodsThumb)*1200);//创建一个750*750的空白图像

            $backurl =$rootdir . '/backend/web/';

            foreach ($goodsThumb as $k=>$pic_path) {

                $dir_name =$backurl . $pic_path;

                $editor->open($image,$dir_name );//打开1.jpeg并且存放到$image1

                $editor->resizeFill($image, '1200','1200');//居中剪裁。就是把较短的变缩放到200px，然后将长边的大于200px的部分居中剪裁掉，图片不会变形

                $editor->blend($imageBack, $image, 'normal', 1, 'top-center',0,$k*1200);//将两个图像合成在一起，第一个图像作为基础，第二个图像在顶部。支持多种混合模式

                $num = strrpos($dir_name,'/');

                $savedir = substr($dir_name,0,$num);

                $savedir = $savedir . '/all_'.$ids.'.jpg';

                $file = $editor->save($imageBack, $savedir );//imageBack保存为all.jpg

            }

    //        var_dump($savedir);die;

            if($file){

    //        $shorturl = str_replace($backurl,"",$savedir);

            $httpurl = $savedir;

            // var_dump($httpurl);die;

            $files = file_get_contents($httpurl);

            header("Content-type:application/octet-stream");

            $filename = pathinfo($httpurl, PATHINFO_BASENAME);

            header("Content-Disposition:attachment;filename=" . $filename);

            header("Accept-ranges:bytes");

            exit($files);

        }else{

                $file = file_get_contents($goodsThumb);

                header("Content-type:application/octet-stream");

                $filename = pathinfo($goodsThumb, PATHINFO_BASENAME);

                header("Content-Disposition:attachment;filename=" . $filename);

                header("Accept-ranges:bytes");

                exit($file);

            }

        }