各位做運維和開發的童鞋，會經常遇到一個問題，那就是有人在辦公室下載東西，網速自然而然地被拉下來了，影響大家上網、辦公。同樣的問題，要是出現在了服務器上面，估計會讓老板發火，事情發展的會更糟……今天特此想大家推薦幾行關於PHP限制網速的代碼，希望給大家一些幫助。
[代碼] [PHP]代碼
// 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!');
}
