[PHP] Giới hạn Tốc độ download bằng php - LIMIT Download - AdminTalk

Chip

PHP Code:

  <?php

/**

 * Download with limited speed class file.



 * Licensed under New BSD License

 * @filesource download_limited.php



 * @since           php 5.0

 * @version         $Revision: 1 $



 * @lastmodified    $Date: 2008-08-18 09:45:49 -0500 (Sat, 18 Oct 2008) $

 * @license         http://www.freebsd.org/copyright/freebsd-license.html New BSD Style License

 */



class DownloadLimited

{       

        /**

         * Send the local file to client with limit download rate as user view file name

         *

         * @param  string $localFile file to send

         * @param  string $userViewFileName filename client will see

         * @param  float  $downloadRate download limit speed in kb/s (ex: 50 kb/s)

         * @return no return

         */

        function sendFile($localFile,$userViewFileName,$downloadRate)

        {

                /** check file exists

                 * @see file_exists

                */

                if(!file_exists($localFile))

                {

                        throw new Exception('File not found execption file :'.$localFile.' not found');

                }       

                /** check file is file 

                 * @see is_file

                */

                if(!is_file($localFile)) 

                {

                        throw new Exception($localFile.' not is a file');

                }

                if(!is_readable($localFile))

                {

                        throw new Exception('file '.$localFile.' not readable ');

                }

                // send headers

                header('Cache-control: private');

                header('Content-Type: application/octet-stream');

                header('Content-Length: '.filesize($localFile));

                header('Content-Disposition: filename='.$userViewFileName);



                // flush header content 

                flush();

                // open file stream

                $file = fopen($localFile, &quot;r&quot;);

                while(!feof($file)) 

                {



                        // send the current file part to the browser

                        print fread($file, round($downloadRate * 1024));



                        // !important flush the content to the browser

                        flush();



                        // !important sleep one second

                        sleep(1);

                }



                // close file stream

                fclose($file);

                        



        }

        /**

         * Send the string data to client with limit download rate as user view file name

         *

         * @param  string string data  to send include ascii,utf-8 character

         * @param  string $userViewFileName filename client will see

         * @param  float  $downloadRate download limit speed in kb/s (ex: 50 kb/s)

         * @return no return

         */

        function sendString($data,$userViewFileName,$downloadRate)

        {

                // send headers

                header('Cache-control: private');

                header('Content-Type: application/octet-stream');

                header('Content-Length: '.strlen($data));

                header('Content-Disposition: filename='.$userViewFileName);

                // flush header content 

                flush();

                

                $start=0;

                $sendSize=0;

                while($sendSize<strlen($data))

                {

                        $sendSize=round($downloadRate*1024);

                        print substr($data,$start,$sendSize);

                        $start=$sendSize;

                        // !important flush the content to the browser

                        flush();



                        // !important sleep one second

                        sleep(1);

                }

        }

        

}

?>

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