Question

我正在使用基于CodeIgniter的Web应用程序，并且我正在实现在管理员中下载车辆图像的zip文件以传递给第三方的功能。

我能够毫无问题地创建zip存档 - 如果我注释掉后面的部分，我可以看到zip文件被创建并包含正确的文件，并且可以正常提取它。

然而，允许用户在创建文件后下载该文件证明是棘手的。我实施的内容允许下载具有正确名称的文件，但在解压缩时出现以下消息时出错：

End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.

知道我哪里出错了吗？我检查了网上的多个教程，但无法找到问题所在。

public function downloadvehicleimages()
{
    // If logged in...
    if ($this->adminuser)
    {
        // Get data
        $usedcars = $this->adminmodel->getUsedCarsWithLimit();

        // Get the registrations for these vehicles
        $registrations = array();
        foreach($usedcars->result_array() as $usedcar)
        {
            array_push($registrations, $usedcar['Registration']);
        }

        // Get all the images for these registrations
        $images = array();
        $original_dir = getcwd();
        chdir('../used-cars/static/images/custom/');
        foreach($registrations as $registration)
        {
            $vehicle_images = glob(strtoupper($registration) . '_*.jpg');
            sort($vehicle_images);
            foreach($vehicle_images as $vehicle_image)
            {
                array_push($images, $vehicle_image);
            }
        }

        // Zip them up
        $zipname = 'images.zip';
        $zip = new ZipArchive;
        $zip->open($zipname, ZipArchive::CREATE);
        foreach($images as $image)
        {
            $zip->addFile($image);
        }
        $zip->close();

        // Let user download the file
        $this->output->set_header('Content-Type: application/zip');
        $this->output->set_header('Pragma: no-cache');
        $this->output->set_header('Expires: 0'); 
        $this->output->set_header("Content-Disposition: attachment;filename='$zipname'");
        $this->output->set_header('Content:Length: ' . filesize($zipname));
        unlink($zipname);
        chdir($original_dir);
    }
}

Answer 1

您需要使用fopen（）来读取zip文件的内容，并使用readfile（）将文件内容传递给访问者。另外，将完整的系统目录uri提供给文件位置：

        $filename = 'images.zip';
        $path = /var/www/yourdomain.com/images.zip';
        if(!file_exists($path))
        {
            die('Error: file not found');
        }
        else {
            $handle = fopen($path, "r");
            header('Content-Description: File Transfer');
            header('Content-Type: application/zip');
            header('Content-Disposition: attachment; filename='.$filename);
            header('Content-Transfer-Encoding: binary');
            header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
            header('Expires: 0');
            header('Pragma: public');
            header('Content-Length: ' . filesize($path));

            flush();
            readfile($path);
            fclose($handle);

可以在PHP中创建zip存档，但无法正确下载

1 个答案: