/** - desc：限制下载速度
- link：bbs.it-home.org
- date：2013/2/25
- */
- // local file that should be send to the client
- $local_file = 'test-file.zip';
// filename that the user gets as default - $download_file = 'your-download-name.zip';
// set the download rate limit (=> 20,5 kb/s) - $download_rate = 20.5;
if(file_exists($local_file) && is_file($local_file)) { - // send headers
- header('Cache-control: private');
- header('Content-Type: application/octet-stream');
- header('Content-Length: '.filesize($local_file));
- header('Content-Disposition: filename='.$download_file);
// flush content - flush();
// open file stream - $file = fopen($local_file, "r");
- while (!feof($file)) {
- // send the current file part to the browser
- print fread($file, round($download_rate * 1024));
- // flush the content to the browser
- flush();
- // sleep one second
- sleep(1);
- }
- // close file stream
- fclose($file);
- }
- else {
- die('Error: The file '.$local_file.' does not exist!');
- }
- ?>
附：修改Discuz论坛实现对附件下载的限速
研究了一下Discuz的代码，实现了一个可行的方案。
很简单，找到attachment.pnp，找到最下面，有个：
function getlocalfile($filename, $readmod = 1, $range = 0)
修改为：
function getlocalfile($filename, $readmod = 1, $range = 0) { - if($fp = @fopen($filename, 'rb')) {
- @fseek($fp, $range);
- $download_rate = 10; //限制网速10kb/s
- while(!feof($fp))
- {
- print fread($fp, round($download_rate * 1024));
- flush();
- ob_flush();
- sleep(1);
- }
- }
- @fclose($fp);
@flush(); @ob_flush(); - }
- ?>
-
经过测试，发现效果还是很明显的。 | 
