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PHP File download with speed limit

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  1. // local file that should be send to the client
  2. $local_file = 'test-file.zip';
  3. // filename that the user gets as default
  4. $download_file = 'your-download-name.zip';
  5.  
  6. // set the download rate limit (=> 20,5 kb/s)
  7. $download_rate = 20.5; 
  8. if(file_exists($local_file) && is_file($local_file)) {
  9.     // send headers
  10.     header('Cache-control: private');
  11.     header('Content-Type: application/octet-stream'); 
  12.     header('Content-Length: '.filesize($local_file));
  13.     header('Content-Disposition: filename='.$download_file);
  14.  
  15.     // flush content
  16.     flush();    
  17.     // open file stream
  18.     $file = fopen($local_file, "r");    
  19.     while(!feof($file)) {
  20.  
  21.         // send the current file part to the browser
  22.         print fread($file, round($download_rate * 1024));    
  23.  
  24.         // flush the content to the browser
  25.         flush();
  26.  
  27.         // sleep one second
  28.         sleep(1);    
  29.     }    
  30.  
  31.     // close file stream
  32.     fclose($file);}
  33. else {
  34.     die('Error: The file '.$local_file.' does not exist!');
  35. }

URL: http://www.jonasjohn.de/snippets/php/dl-speed-limit.htm

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