用PHP强制下载的问题 [英] Issues with force download in php

问题描述

我写了一个PHP脚本来强制将文件下载给用户。一切正常，但有一个例外，文件未完全下载，假设有10 MB的mp3文件下载，但5 MB后停止并显示下载完成。

I have written a PHP script to force download files to users. Everything works great with one exception, the file is not completely downloaded let's say there is a 10 MB mp3 file downloading, but it stops after 5 MB and displays download completed.

我的网站托管者是godaddy.com

并且代码在下面

My site host is godaddy.com
And the code is below

<?php
if(ini_get('zlib.output_compression')) {
    ini_set('zlib.output_compression', 'Off');
}

if ( isset ( $_REQUEST['file_name'] )) {
    $filename = basename($_REQUEST['file_name']);
    $filesize = filesize("mp3gallery/".$_REQUEST['file_name']);

    header("Pragma: public");
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Cache-Control: private",false);
    header("Content-length: $filesize");
    header("Content-Transfer-Encoding: binary");
    header('Content-type: audio/mpeg, audio/x-mpeg, audio/x-mpeg-3, audio/mpeg3');
    header('Content-Disposition: attachment; filename="'.$filename.'"');

    $read_file = "mp3gallery/".$_REQUEST['file_name'];




    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;

   }
   readfile_chunked($read_file,true); 
}
?>

请帮助.........

Please Help.........

推荐答案

问题可能是您的脚本超时。

The problem is probably that your script times out.

那您该怎么办？

• 更改时间限制（可能无法执行，因为您的主机不允许您这样做）


• 加快速度

关于后者：是否有特定的原因导致您不仅仅使用 fpassthru ？我希望它具有更好的性能。

Regarding the latter: is there a specific reason why you don't just use fpassthru? I'd expect it to have better performance.

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