Download file with speed limit using PHP

Here we are explaining about how to limit speed for the file download operation.


<?php
// File form server
$local_file = 'user.php';

// filename that the user gets as default
$download_file = 'myFile.php';

// set the download rate limit (=> 10 kb/s)
$download_rate = 10;

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 * 10));

        // 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!');
}
?>

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