各位做运维的童鞋，会经常遇到一个问题，那就是有人再办公室下载东西，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。
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// local file that should be send to the client
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$local_file = 'test-file.zip';
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// filename that the user gets as default
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$download_file = 'your-download-name.zip';
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// set the download rate limit (=> 20,5 kb/s)
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$download_rate = 20.5;
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if(file_exists($local_file) && is_file($local_file)) {
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// send headers
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header('Cache-control: private');
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header('Content-Type: application/octet-stream');
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header('Content-Length: '.filesize($local_file));
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header('Content-Disposition: filename='.$download_file);
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// flush content
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flush();
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// open file stream
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$file = fopen($local_file, "r");
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while (!feof($file)) {
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// send the current file part to the browser
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print fread($file, round($download_rate * 1024));
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// flush the content to the browser
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flush();
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// sleep one second
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sleep(1);
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}
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// close file stream
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fclose($file);
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}
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else {
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die('Error: The file '.$local_file.' does not exist!');
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}
