php，文件下载 [英] php, file download

问题描述

我正在使用简单的文件下载脚本：

I am using the simple file downloading script:

if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename='.basename($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($file));
    ob_clean();
    flush();
    readfile($file);
    exit;
}

它正在我的本地服务器上工作达到200mb。

It is working on my localserver upto 200mb.

当我在我的网站上尝试这个代码，它下载173KB而不是200MB的文件。

When i try this code in my website it downloads 173KB instead of 200MB file.

我检查了一切，写了一些自定义代码（使用ob函数和fread而不是readfile），但无法下载大文件。

I checked everything, wrote some custom code (using ob functions and fread instead of readfile) but can't download big files.

感谢您的答案。

• 我正在使用Apache 2.2，PHP 5.3


• 处理大文件的所有PHP设置都可以。 （执行时间，内存限制，...

推荐答案

代码是您无法控制输出流，您让PHP处理它，而不知道背景中正在发生什么：

One issue I have with the following code is you have no control over the output stream, your letting PHP handle it without knowing exactly what is going on within the background:

您应该做什么设置输出系统，您可以控制和复制accros服务器。

What you should do is set up an output system that you can control and replicated accros servers.

例如：

if (file_exists($file))
{
    if (FALSE!== ($handler = fopen($file, 'r')))
    {
        header('Content-Description: File Transfer');
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename='.basename($file));
        header('Content-Transfer-Encoding: chunked'); //changed to chunked
        header('Expires: 0');
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Pragma: public');
        //header('Content-Length: ' . filesize($file)); //Remove

        //Send the content in chunks
        while(false !== ($chunk = fread($handler,4096)))
        {
            echo $chunk;
        }
    }
    exit;
}
echo "<h1>Content error</h1><p>The file does not exist!</p>";

这只是基本的，但一定要走！

This is only basic but give it a go!

另请阅读我的回覆： file_get_contents => PHP致命错误：允许内存耗尽

这篇关于php，文件下载的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！