log and redirect

    <?php

    //get IP
    if (getenv("HTTP_CLIENT_IP")) $ip = getenv("HTTP_CLIENT_IP");
    else if(getenv("HTTP_X_FORWARDED_FOR")) $ip = getenv("HTTP_X_FORWARDED_FOR");
    else if(getenv("REMOTE_ADDR")) $ip = getenv("REMOTE_ADDR");
    else $ip = "UNKNOWN";

    // log download and redirect to file
    if (isset($_GET['dl']))
    {
      $filename = $_GET['dl'];
      $ff = fopen('down_log.txt', 'a');
      $today = date("Y-m-d H:i");
      fwrite($ff,"$today - $ip - $filename<br>");
      fclose($ff);
      header("Location: https://mydomain.tld/$filename");
      die;
    }

    ?>