Limit download speed using PHP

Question

I found on Google some PHP scripts to limit the download speed of a file, but the file download at 10 Mbps or if it download at 80 kbps as i set it, after 5 mb, it stops downloading.

Can some one tell me where I can found a good PHP download speed limit script please?

Thank you very much

--- Edit ---

Here is the code :

<?php
set_time_limit(0);
// change this value below
$cs_conn = mysql_connect('localhost', 'root', '');
mysql_select_db('shareit', $cs_conn);

// local file that should be send to the client
$local_file = $_GET['file'];
// filename that the user gets as default
$download_file = $_GET['file'];

// set the download rate limit (=> 20,5 kb/s)
$download_rate = 85; 
if(file_exists($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!');
}




if ($dl) {
} else {
    header('HTTP/1.0 503 Service Unavailable');
    die('Abort, you reached your download limit for this file.');
}
?>

Answer 1

The reason your download stops after 5MB is because it takes over 60 seconds to download 5MB at 80KB/s. Most of those "speed limiter" scripts use sleep() to pause for a while after sending a chunk, resume, send another chunk, and pause again. But PHP will automatically terminate a script if it's been running for a minute or more. When that happens, your download stops.

You can use set_time_limit() to prevent your script from being terminated, but some web hosts will not allow you to do this. In that case you're out of luck.

Answer 2

A second is too much time, it will make clients think that the server is unresponsive and prematurely end the download. Change sleep(1) to usleep(200):

set_time_limit(0);

$file = array();
$file['name'] = 'file.mp4';
$file['size'] = filesize($file['name']);

header('Content-Type: application/octet-stream');
header('Content-Description: file transfer');
header('Content-Disposition: attachment; filename="' . $file['name'] . '"');
header('Content-Length: '. $file['size']);

$open = fopen($file['name'], 'rb');
while( !feof($open) ){
    echo fread($open, 256);
    usleep(200);
}
fclose($open);