php限制文件下载速度

1. // local file that should be send to the client
2. $local_file = 'test-file.zip';
4. // filename that the user gets as default
5. $download_file = 'your-download-name.zip';
7. // set the download rate limit (=> 20,5 kb/s)
8. $download_rate = 20.5;
10. if(file_exists($local_file) && is_file($local_file)) {
12. // send headers
13. header('Cache-control: private');
14. header('Content-Type: application/octet-stream');
15. header('Content-Length: '.filesize($local_file));
16. header('Content-Disposition: filename='.$download_file);
18. // flush content
19. flush();
21. // open file stream
22. $file = fopen($local_file, "r");
24. while (!feof($file)) {
26. // send the current file part to the browser
27. print fread($file, round($download_rate * 1024));
29. // flush the content to the browser
30. flush();
32. // sleep one second
33. sleep(1);
34. }
36. // close file stream
37. fclose($file);
39. }
40. else {
41. die('Error: The file '.$local_file.' does not exist!');
42. }

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下载速度, php