Error with my second web/booter someone help !!!

So I got an error on my website : www.zer0-days.com
I really want to know how to fix this shit my db.php if fine to me!
<?php
if(strpos(strtolower($_SERVER['SCRIPT_NAME']),strtolower(basename(__FILE__)))){
die('Error, Your IP Address Has Been Logged!');
}
define('DB_HOST', 'localhost');
define('DB_NAME', 'stress');
define('DB_USERNAME', 'stress');
define('DB_PASSWORD', 'ed41899');
$odb = new PDO('mysql:host=' . DB_HOST . ';dbname=' . DB_NAME, DB_USERNAME, DB_PASSWORD);
?>
am new to this so someone help me out

Your server doesn't have the PDO extension installed. You should contact your host and see if they can enable it for you. If not, your script isn't going to work.