php實現限制下載速度的示例

 這篇文章主要介紹了php實現限制下載速度的示例,需要的朋友可以參考下

 代碼如下: // 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!'); }