PHP readfile() 和大量下载 [英] PHP readfile() and large downloads

问题描述

在设置在线文件管理系统时，现在遇到了障碍.

While setting up an online file management system, and now I have hit a block.

我正在尝试使用此 修改后的文件将文件推送到客户端读取文件的版本:

function readfile_chunked($filename,$retbytes=true) { 
   $chunksize = 1*(1024*1024); // how many bytes per chunk 
   $buffer = ''; 
   $cnt =0; 
   // $handle = fopen($filename, 'rb'); 
   $handle = fopen($filename, 'rb'); 
   if ($handle === false) { 
       return false; 
   } 
   while (!feof($handle)) { 
       $buffer = fread($handle, $chunksize); 
       echo $buffer; 
       ob_flush(); 
       flush(); 
       if ($retbytes) { 
           $cnt += strlen($buffer); 
       } 
   } 
       $status = fclose($handle); 
   if ($retbytes && $status) { 
       return $cnt; // return num. bytes delivered like readfile() does. 
   } 
   return $status; 
}

但是当我尝试下载 13 MB 的文件时，它的大小刚好达到 4 MB.这里会出现什么问题?这绝对不是任何形式的时间限制，因为我在本地网络上工作，速度不是问题.

But when I try to download a 13 MB file, it's just breaking at 4 MB. What would be the issue here? It's definitely not the time limit of any kind because I am working on a local network and speed is not an issue.

PHP 中的内存限制设置为 300 MB.

The memory limit in PHP is set to 300 MB.

感谢您的帮助.

推荐答案

您很可能达到了 Web 服务器设置的响应缓冲区限制.众所周知，IIS 和 FastCGI 的默认缓冲区大小为 4mb.我将通过查看网络服务器<->PHP SAPI 配置来开始您的搜索.

Most likely you are hitting the response buffer limit set by your webserver. IIS and FastCGI are known to have 4mb as the default buffer size. I would start your search with looking into the webserver<->PHP SAPI configuration.

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