PHP限制文件下载的速度

限制文件下载的速度

<?php
// 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!');
}
?>