Set limitation for download rate

This snippet allows you set a limitation for download rate of the file that visitors download from your site.

<?php
/* 
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.in/
*/
/* set here a limit of downloading rate (e.g. 10.20 Kb/s) */
$download_rate = 10.20;

$download_file = 'download-file.zip'; 
$target_file = 'target-file.zip';

if(file_exists($download_file)){
/* headers */
header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');
header('Cache-control: private');
header('Content-Type: application/octet-stream');
header('Content-Length: '.filesize($download_file));
header('Content-Disposition: filename='.$target_file);

/* flush content */
flush();

/* open file */
$fh = @fopen($download_file, 'r');
while(!feof($fh)){
/* send only current part of the file to browser */
print fread($fh, round($download_rate * 1024));
/* flush the content to the browser */
flush();
/* sleep for 1 sec */
sleep(1);
}
/* close file */
@fclose($fh);
}else{
die('Fatal error: the '.$download_file.' file does not exist!');
}
?>

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