发送正确的文件大小与PHP脚本下载 [英] Sending correct file size with PHP download script

问题描述

我在PHP中创建的文件下载脚本，它的工作原理，但网页浏览器报告文件为未知长度。我的code是如下：

 函数downloadFile（$文件）{
  //设置下载系统...
  标题（内容说明：文件传输'）;
  标题（内容类型：.mime_content_type（$文件））;
  标题（内容处置：附件;文件名='基名（$文件）。''）;
  标题（内容传输编码：二进制'）;
  头（'过期：0'）;
  标题（缓存控制：必重新验证，检查后= 0，pre-检查= 0'）;
  头（'杂注：公开'）;
  标题（内容长度：.filesize（$文件））;  //清空缓存
  ob_clean（）;
  冲洗（）;  //发送文件到浏览器
  ReadFile的（$文件）;  //什么也不做后文件下载
  出口;
}
 

解决方案

http://paul.luminos.nl/update本来/ 471 ：

  

借助 CrimsonBase网站通过并使它们通过一个类似于由安德鲁·约翰逊的his文章关于PHP控制文件下载。

  
  

安德鲁使得一个非常重要的意见在文章的结尾：

  
  

    

如果你的COM preSS与Zlib压缩，mod_deflate模块等等Content-Length头将不准确，所以你最终看到的文件未知大小和未知剩余时间下载文件时。

  
  
  

我想强调这一点：如果你的浏览器不似乎服从你的PHP生成的头脚本，特别是的Content-Length - 它是相当可能的阿帕奇的 mod_deflate模块扩展功能。

  
  

您可以用下面的行适用的的.htaccess 文件轻松地禁用它为一个脚本：

  SetEnvIfNoCase REQUEST_URI ^ /下载\\ .PHP无gzip的不要，各不相同
 

  
  

在这里的download.php这里假设是在位于服务器的根目录路径的下载脚本（例如 www.crimsonbase.com/download.php ）。 （这是因为常规的前pression是 ^ /下载\\的.php ）

I created a file download script in PHP, it works, but web browsers report the file as "Unknown Length". My code is as follows:

function downloadFile($file){
  // Set up the download system...
  header('Content-Description: File Transfer');
  header('Content-Type: '.mime_content_type($file));
  header('Content-Disposition: attachment; filename="'.basename($file).'"');
  header('Content-Transfer-Encoding: binary');
  header('Expires: 0');
  header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
  header('Pragma: public');
  header('Content-Length: '.filesize($file));

  // Flush the cache
  ob_clean();
  flush();

  // Send file to browser
  readfile($file);

  // DO NOT DO ANYTHING AFTER FILE DOWNLOAD
  exit;
}

解决方案

Originally from http://paul.luminos.nl/update/471:

The CrimsonBase website verifies downloads by passing them through a robust PHP script similar to the one published by Andrew Johnson in his article about PHP-controlled file downloads.

Andrew makes a very important comment at the end of the article:

"If you compress files with Zlib, mod_deflate and so on the Content-Length header won't be accurate so you'll end up seeing "Unknown size" and "Unknown time remaining" when downloading files."

I would like to stress this: if your browser doesn't appear to be obeying the headers generated by your PHP script—especially Content-Length—it is fairly likely that Apache's mod_deflate extension is enabled.

You can easily disable it for a single script using the following line in an applicable .htaccess file:

SetEnvIfNoCase Request_URI ^/download\.php no-gzip dont-vary

where download.php is here assumed to be in the download script located in the server's root directory path (e.g. www.crimsonbase.com/download.php). (That's because the regular expression is ^/download\.php.)

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