Using PHP to limit download speed

chipgraphics · #1 November 19th, 2005, 06:26 PM

: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

KUB365 · #2 November 20th, 2005, 01:59 PM

Here is a snippet i found on php.net.

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[font=Courier New]<?php
 
$file = "test.mp3"; [/font][font=Courier New]// file to be send to the client

$speed = 8.5; [/font][font=Courier New]// 8,5 kb/s download rate limit
 
if(file_exists($file) && is_file($file[/font][font=Courier New])) {
 
   header("Cache-control: private"[/font][font=Courier New]);

   header("Content-Type: application/octet-stream"[/font][font=Courier New]); 

   header("Content-Length: ".filesize($file[/font][font=Courier New]));

   header("Content-Disposition: filename=$file" . "%20"[/font][font=Courier New]); 
 
   flush[/font][font=Courier New]();
 
   $fd = fopen($file, "r"[/font][font=Courier New]);

   while(!feof($fd[/font][font=Courier New])) {

         echo fread($fd, round($speed*1024[/font][font=Courier New]));

       flush[/font][font=Courier New]();

       sleep(1[/font][font=Courier New]);

   }

   fclose ($fd[/font][font=Courier New]);
 
}

?> [/font]

Link to page and exact code.

chipgraphics · #3 November 29th, 2005, 09:52 PM

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.

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<?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;

}

?>

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

~Chipgraphics

KUB365 · #4 November 29th, 2005, 10:14 PM

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

Flegma · #5 March 8th, 2006, 03:36 PM

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??

KUB365 · #6 March 8th, 2006, 05:06 PM

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

Flegma · #7 March 8th, 2006, 05:19 PM

Quote:

Originally Posted by KUB365

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....

pezhvak · #8 July 5th, 2009, 04:14 PM

Quote:

Originally Posted by Flegma

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??

it's because php stops your script (your script will timeout).. to avoid it, copy following code in the top of your script:

set_time_limit(99999999);

s1dest3pnate · #9 September 15th, 2009, 06:25 AM

I'm pretty new to PHP. Where in this file would I include the name of the file that I want the user to download or is there a different way to set what file to use this script for? Thanks in advance!

Dormilich · #10 September 15th, 2009, 07:03 AM

the file name is the function’s first parameter.

s1dest3pnate · #11 September 15th, 2009, 07:11 AM

My fault. I meant in chipgraphics code.

I would assume I would input the filename somewhere in this line:

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$filename = basename($file);

If not, where?

Thanks in advance.

Dormilich · #12 September 15th, 2009, 07:37 AM

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function send_file($file, $speed = 100) {

as can be deduced from line 5 to 9.

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