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

[Cyber Army]

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

 

[Fireworks]

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.