PHP - FILE DOWNLOAD WITH SPEED LIMIT

If you are planning to create a file sharing website then you would already know that bandwidth is the key. Here is how you can limit the speed at which the file will download.

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<?php // local file that should be send to the client $local_file = 'test-file.zip'; // filename that the user gets as default $download_file = 'your-download-name.zip'; // set the download rate limit (=> 20,5 kb/s) $download_rate = 20.5; if(file_exists($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!'); } ?>