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Download File with a Speed Limit in PHP

/ Published in: PHP
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This snippet allows you set a limitation for download rate of the file that visitors download from your site.

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Copy this code and paste it in your HTML 
  1. <?php
  2. /* set here a limit of downloading rate (e.g. 10.20 Kb/s) */
  3. $download_rate = 10.20;
  4.  
  5. $download_file = 'download-file.zip';  
  6. $target_file = 'target-file.zip';
  7.  
  8. if(file_exists($download_file)){ 
  9.     /* headers */
  10.     header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');
  11.     header('Cache-control: private');
  12.     header('Content-Type: application/octet-stream');
  13.     header('Content-Length: '.filesize($download_file));
  14.     header('Content-Disposition: filename='.$target_file);
  15.  
  16.     /* flush content */
  17.     flush();
  18.  
  19.     /* open file */
  20.     $fh = @fopen($download_file, 'r'); 
  21.     while(!feof($fh)){ 
  22.         /* send only current part of the file to browser */
  23.         print fread($fh, round($download_rate * 1024));
  24.         /* flush the content to the browser */
  25.         flush(); 
  26.         /* sleep for 1 sec */
  27.         sleep(1);
  28.     } 
  29.     /* close file */
  30.     @fclose($fh); 
  31. }else{
  32.     die('Fatal error: the '.$download_file.' file does not exist!');
  33. }
  34. ?>

URL: http://www.apphp.com/index.php?snippet=php-download-file-with-speed-limit

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