Giới hạn tốc độ download bằng php
CODE <?php /** * Download with limited speed class file. * * i-php group : <http://i-php.net/> * Copyright (c) <2008>, <i-php.net> * Licensed under New BSD License * @filesource download_limited.php * @copyright Copyright 2008, i-php group * @author habogay@gmail.com * @link http://i-php.net/about/ * @since php 5.0 * @version $Revision: 1 $ * @modifiedby $LastChangedBy: habogay $ * @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, "r"); 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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