Using PHP to limit download speed

:confused::confused:

I have been on the quest to find a php script that can serve files for downloads and limit the speed at which the file is transfered to the user. I want a faster download speed for registered members and a slower speed for guests.

The only other thing I can think of is using the header() function to force a download for the requested file type and stream the file to the user's browser. Then using sleep() or usleep() on a loop until the download completes.

Anyone have any suggestions or ideas?

~Chipgraphics

Here is a snippet i found on php.net.

Link to page and exact code.

With the constant change of protocols and programming yada yada. I read over what you had suggested and combined a couple of the concepts into one package deal. And it worked on the first try ! :D So, thank you for pointing me in the right direction ! I'll list my source code below.

Here's a function to use PHP to control download bandwith speed:
All original code I borrowed from PHP's online documentation found HERE.

[PHP]
<?php
function send_file($file, $speed = 100) {

//First, see if the file exists
if (!is_file($file)) {
die("<b>404 File not found!</b>");
}
//Gather relevent info about file
$filename = basename($file);
$file_extension = strtolower(substr(strrchr($filename,"."),1));
// This will set the Content-Type to the appropriate setting for the file
switch( $file_extension ) {
case "exe":
$ctype="application/octet-stream";
break;
case "zip":
$ctype="application/zip";
break;
case "mp3":
$ctype="audio/mpeg";
break;
case "mpg":
$ctype="video/mpeg";
break;
case "avi":
$ctype="video/x-msvideo";
break;

// The following are for extensions that shouldn't be downloaded
// (sensitive stuff, like php files)
case "php":
case "htm":
case "html":
case "txt":
die("<b>Cannot be used for ". $file_extension ." files!</b>");
break;
default:
$ctype="application/force-download";
}

// Begin writing headers
header("Cache-Control:");
header("Cache-Control: public");
header("Content-Type: $ctype");

$filespaces = str_replace("_", " ", $filename);
// if your filename contains underscores, replace them with spaces

$header='Content-Disposition: attachment; filename='.$filespaces;
header($header);
header("Accept-Ranges: bytes");

$size = filesize($file);
// check if http_range is sent by browser (or download manager)
if(isset($_SERVER['HTTP_RANGE'])) {
// if yes, download missing part

$seek_range = substr($_SERVER['HTTP_RANGE'] , 6);
$range = explode( '-', $seek_range);
if($range[0] > 0) { $seek_start = intval($range[0]); }
if($range[1] > 0) { $seek_end = intval($range[1]); }

header("HTTP/1.1 206 Partial Content");
header("Content-Length: " . ($seek_end - $seek_start + 1));
header("Content-Range: bytes $seek_start-$seek_end/$size");
} else {
header("Content-Range: bytes 0-$seek_end/$size");
header("Content-Length: $size");
}
//open the file
$fp = fopen("$file","rb");

//seek to start of missing part
fseek($fp,$seek_start);

//start buffered download
while(!feof($fp)) {
//reset time limit for big files
set_time_limit(0);
print(fread($fp,1024*$speed));
flush();
sleep(1);
}
fclose($fp);
exit;
}
?>[/PHP]

I hope that helps someone out too. Thanks again for pointing me in the right direction !!


~Chipgraphics

Hey, congrats on getting the results you were looking for.

Thanks for posting the code for people to learn from, that's what this forum is all about.


~KUB

I used that script from php.net but i have a problem. When i click on download it starts download, but on ~600kB it stops and dont download....
can abybody explain me thit??

Download issues from their server. Maybe wait for a few hrs and try again.

it is localhost.....
can it be some option of apache ???
in my webhosting i tried to download 20 MB and it was OK....