实现二维码生成打包并下载

public function export_ewm()
{

        set_time_limit(0);
        $search = $this->request->post('search');
        $ids = $this->request->post('ids');
        $filter = $this->request->post('filter');
        $op = $this->request->post('op');
        $columns = $this->request->post('columns');

        $whereIds = $ids == 'all' ? '1=1' : ['deputy.id' => ['in', explode(',', $ids)]];
        $this->request->get(['search' => $search, 'ids' => $ids, 'filter' => $filter, 'op' => $op]);
    $this->relationSearch=true;
        list($where, $sort, $order, $offset, $limit) = $this->buildparams();


        $protocol=$this->request->isSsl()?'https://' : 'http://';
        $url = $protocol . $_SERVER['HTTP_HOST'].'/index/index/res/unicode/';



        $list=$this->model
            ->where($where)->with(['county','street','station'])
            ->where($whereIds)
            ->select();
        if(!$list){
            $this->error(__('No rows were found'));
        }

        /* 2. 指定中文目录名（可按需改成 POST 参数） */
        $cnFolder = date('YmdHis').rand(1000,9999);          // 想叫啥写啥
        $tmpDir   = ROOT_PATH . '/public/tmp/' . $cnFolder;   // 完整路径
        if (!is_dir($tmpDir) && !mkdir($tmpDir, 0777, true)) {
            exit('创建临时目录失败，请检查权限或路径');
        }
        foreach ($list as $k=>$v){
            $qrCode = new QrCode($this->request->domain().'/index/appeal/index?npc_deputy_id='.$v["id"]);
            $qrCode->setSize(300)->setMargin(0);
            $writer = new PngWriter();

            $png = $writer->write($qrCode)->getString();
            $mulu=$tmpDir . '/' .$v['county']['name'].'-'.$v['street']['name'].'-'.$v['station']['name'];
            if (!is_dir($mulu) && !mkdir($mulu, 0777, true)) {
                exit('创建目录失败：' . $mulu);
            }
            $safeName = preg_replace('/[\/\\\\:\*\?"<>|]/u', '_', $v['name']);
            file_put_contents($mulu . '/' . $v['id'] . '.' . $safeName . '.png', $png);
        }

        /* 4. 打包（把中文目录整体打进去，解压后仍能看到中文目录） */
        $zipFile = ROOT_PATH . '/public/tmp/' . $cnFolder. '.zip';
        $zip = new \ZipArchive();
        if ($zip->open($zipFile, \ZipArchive::CREATE) !== true) {
            exit('无法创建 zip');
        }
        /* 4.1 递归添加目录 */
        $iterator = new \RecursiveIteratorIterator(
            new \RecursiveDirectoryIterator($tmpDir, \FilesystemIterator::SKIP_DOTS),
            \RecursiveIteratorIterator::SELF_FIRST
        );

        foreach ($iterator as $file) {
            $localPath = str_replace($tmpDir . DIRECTORY_SEPARATOR, '', $file->getPathname());
            // 转 GBK，让 Windows 自带解压不乱码
            $gbkPath = iconv('UTF-8', 'GBK//IGNORE', $cnFolder . '/' . $localPath);
            if ($file->isDir()) {
                $zip->addEmptyDir($gbkPath);
            } else {
                $zip->addFile($file->getPathname(), $gbkPath);
            }
        }

        $zip->close();
        $this->redirect('/tmp/' . $cnFolder. '.zip');
    }