可以在PHP中创建zip存档，但无法正确下载

Question

我正在开发一个基于CodeIgniter的web应用程序，并且我正在实现下载管理中的车辆图像的zip文件的功能，以传递给第三方派对。

我可以毫无问题地创建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。

但是，允许用户在创建文件后下载该文件是非常棘手的。我已经实现了允许与要下载的正确名称的文件，但它的错误时，以下消息解压：

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. 

任何想法，我已经错了吗？我在网上查了多篇教程，并找不到问题出在哪里。

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zipfile的内容，并使用readfile（）将文件内容传递给访问者。而且，提供完整的系统目录的URI的文件位置：

 $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);