Script Anti DDoS

<?php
 try{
  if (!file_exists('anti_ddos/start.php'))
   throw new Exception ('anti_ddos/start.php does not exist');
  else
   require_once('anti_ddos/start.php');
 }
 //CATCH the exception if something goes wrong.
 catch (Exception $ex) {
  // et's print a message saying there is an error
  echo '<div style="padding:10px;color:white;position:fixed;top:0;left:0;width:100%;background:black;text-align:center;">The <a href="https://github.com/sanix-darker/antiddos-system" target="_blank">"AntiDDOS System"</a> failed to load properly on this Web Site, please de-comment the 'catch Exception' to see what happening!</div>';
  //Print out the exception message.
  //echo $ex->getMessage();
 }
 // cp -r AntiDDOS-system/ /var/www/html/
?>
---- THE HTML PAGE CONTENT ----