如何通过PHP实现精确控制文件下载速度的设置？

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php// 设置要发送给客户端的本地文件$local_file='test-file.zip';

// 用户默认获取的文件名$download_file='your-download-name.zip';

// 设置下载速率限制（=20, 5 kb/s）$download_rate=20.5;

// 检查文件是否存在if (file_exists($local_file)) { // 设置响应头信息 header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header(Content-Disposition: attachment; filename=\$download_file\); header(Expires: 0); header(Cache-Control: must-revalidate); header(Pragma: public); header(Content-Length: . filesize($local_file)); header(Accept-Ranges: bytes); header(Content-Transfer-Encoding: binary); header(X-Accel-Buffering: no);

// 限制下载速率 set_time_limit(0); $fp=fopen($local_file, rb); if ($fp) { $buffer=; while (!feof($fp) && connection_status()==0) { $buffer=fread($fp, 1024); echo $buffer; flush(); sleep(1 / $download_rate); } fclose($fp); } exit;} else { // 文件不存在 echo File does not exist.; exit;}

<?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!'); } ?>