How can I add a download speed limit to this php script?

问题

I found this great script to download and protect the files from a directory:

http://www.gowondesigns.com/?page.getfile

And I saw this code from a website too:

// 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!');
}

How can I combine them? I mean how can I use the getfile script and add a download rate to it?

I tried adding:

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);
}

But instead of $file I think it should be $fd and I had no positive results

What am I doing wrong?

回答1:

Based on your comment - I assume you want the following:

// 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);

You should note, however, that it is the whole script that will make it successfully prompt a user to download the file and speed limit it. Simply rename the first script in your question as download.php, then link to it as <a href='download.php?id=1'>Download 1</a> (then file ID 1 will download).

<?php

$file_id = $_GET['id'];

if($file_id == 1){
    // 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';
} else {
    die('Invalid file selected for download');
}

// 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!');
}
?>

回答2:

<?php

$file =  @$_GET["file"];

$rate = 100;  //  kb/sn

if (!file_exists($file)) {die("File Not Found");}

header("Content-Disposition: attachment; filename=" . $file);    
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");
header("Content-Description: File Transfer");             
header("Content-Length: " . filesize($file));
flush(); // this doesn't really matter.

$fp = fopen($file, "r"); 
while (!feof($fp))
{
    echo fread($fp, $rate * 1024); 
    flush(); 
    sleep(1);
}  
fclose($fp); 
?>

i use this . And no problem.

来源：https://stackoverflow.com/questions/9257084/how-can-i-add-a-download-speed-limit-to-this-php-script