Getting binary data from MySQL to download into a zip

[BeBop]

Sorry bout the long name...

Well anyways, now since ive got hte whole displaying an imge thing working, how would i get it so pretty much the same works with a zip file so the person (upon clicking hte link) will get the zip file to download?

This is what i have so far and it just gives me a dl.php filled with the binary data lol...

PHP Code:

 $query = "SELECT * FROM mapdb_maps WHERE mid='$id'";
    $result = mysql_query($query) or die(mysql_error());

    while($row = mysql_fetch_array($result)){
    $data = $row['file'];
    
    }
    
    header("Content-type: application/x-zip");
    echo $data;