BELOW CODE MUST BE INSERTED ABOVE <head> IN PHP INDEX FILE

<?php

if(!defined('WB_URL')) {
        header('Location: ../index.php');
        exit(0);
}

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">