前端之家收集整理的这篇文章主要介绍了
php 控制下载速度实现方法，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
对
PHP控制下载速度感兴趣的小伙伴，下面一起跟随编程之家 jb51.cc的小编两巴掌来看看吧！
/**
* PHP控制下载速度
*
* @param
* @arrange 网： jb51.cc
**/
// 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!');
}
/*** 来自编程之家 jb51.cc（jb51.cc） ***/
