复制代码 代码如下:

// 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!');

}