PHP限制文件下载的速度

1. // local file that should be send to the client
2. $local_file = 'test-file.zip';
3. // filename that the user gets as default
4. $download_file = 'your-download-name.zip';
6. // set the download rate limit (=> 20,5 kb/s)
7. $download_rate = 20.5;
8. if(file_exists($local_file) && is_file($local_file)) {
9. // send headers
10. header('Cache-control: private');
11. header('Content-Type: application/octet-stream');
12. header('Content-Length: '.filesize($local_file));
13. header('Content-Disposition: filename='.$download_file);
15. // flush content
16. flush();
17. // open file stream
18. $file = fopen($local_file, "r");
19. while(!feof($file)) {
21. // send the current file part to the browser
22. print fread($file, round($download_rate * 1024));
24. // flush the content to the browser
25. flush();
27. // sleep one second
28. sleep(1);
29. }
31. // close file stream
32. fclose($file);}
33. else {
34. die('Error: The file '.$local_file.' does not exist!');
35. }
36. ?>

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PHP