使用 PHP 限制下载速度

Can some one tell me where I can found a good PHP download speed limit script please?

非常感谢

--- 编辑---

代码如下:

<?php
set_time_limit(0);
// change this value below
$cs_conn = mysql_connect('localhost', 'root', '');
mysql_select_db('shareit', $cs_conn);

// local file that should be send to the client
$local_file = $_GET['file'];
// filename that the user gets as default
$download_file = $_GET['file'];

// set the download rate limit (=> 20,5 kb/s)
$download_rate = 85; 
if(file_exists($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!');
}




if ($dl) {
} else {
    header('HTTP/1.0 503 Service Unavailable');
    die('Abort, you reached your download limit for this file.');
}
?>

推荐答案

下载 5MB 后停止的原因是因为以 80KB/s 的速度下载 5MB 需要 60 多秒.大多数限速器"脚本使用 sleep() 在发送一个块后暂停一段时间，继续，发送另一个块，然后再次暂停.但是如果脚本已经运行了一分钟或更长时间，PHP 会自动终止它.发生这种情况时，您的下载会停止.