Not show file size when download by this script

This script limit download but problem when download not show the file size.Anyone please help me.

<?php
// Set the maximum number of downloads (actually, the number of page loads)
$maxdownloads = "5";
// Set the key's viable duration in seconds (86400 seconds = 24 hours)
$maxtime = "3600";

require ('dbconnect.php');

    if(get_magic_quotes_gpc()) {
        $id = stripslashes($_GET['id']);
    }else{
        $id = $_GET['id'];
    }

    // Get the key, timestamp, and number of downloads from the database
    $query = sprintf("SELECT * FROM downloadkey WHERE uniqueid= '%s'",
    mysql_real_escape_string($id, $link));
    $result = mysql_query($query) or die(mysql_error());
    $row = mysql_fetch_array($result);
    if (!$row) {
        echo "The download key you are using is invalid.";
    }else{
        $timecheck = date('U') - $row['timestamp'];
       
        if ($timecheck >= $maxtime) {
            echo "This key has expired (exceeded time allotted).<br />";
        }else{
            $downloads = $row['downloads'];
            $downloads += 1;
            if ($downloads > $maxdownloads) {
                echo "This key has expired (exceeded allowed downloads).<br />";
            }else{
                $sql = sprintf("UPDATE downloadkey SET downloads = '".$downloads."' WHERE uniqueid= '%s'",
    mysql_real_escape_string($id, $link));
                $incrementdownloads = mysql_query($sql) or die(mysql_error());
               
// Debug        echo "Key validated.";

// Force the browser to start the download automatically

/*
    Variables:
        $file = real name of actual download file on the server
        $filename = new name of local download file - this is what the visitor's file will actually be called when he/she saves it
*/

   ob_start();
   $mm_type="application/octet-stream";
   $file = "http://mysite.com/kgbkigh/".$_GET['ids'].".mp4";
   $filename = "mysite-".$_GET['ids']."(mysite.com).mp4";
   header("Cache-Control: public, must-revalidate");
   header("Pragma: no-cache");
   header("Content-Type: " . $mm_type);
   header("Content-Length: " .(string)(filesize($file)) );
   header('Content-Disposition: attachment; filename="'.$filename.'"');
   header("Content-Transfer-Encoding: binary\n");
   ob_end_clean();
   readfile($file);

            }
        }
    }
?>

PHP:

 

You mean to show file size after download?

To show it on page where the originating form resides, I could think of saving that

filesize($file)

Code (markup):

into a session var then retrieve it with an ajax, right after submission.

 

If you want to deliver a large file, you need to send this file in parts. Search google "php streaming big files".