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【PHP】 PHP实现限速的下载

作者: / 发布于2011/1/4/ 656

<div>// 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!');
} 
</div>

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