各位做运维和开发的童鞋，会经常遇到一个问题，那就是有人在办公室下载东西，网速自然而然地被拉下来了，影响大家上网、办公。同样的问题，要是出现在了服务器上面，估计会让老板发火，事情发展的会更糟……今天特此想大家推荐几行关于PHP限制网速的代码，希望给大家一些帮助。
| // 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!'); |
| } |
