$servername="localhost";
        $userdb="userdata";
        $passdb="passdata";
        $connection=new PDO("mysql:host=$servername;port=3306;dbname:loginDB;charset=utf8", $userdb, $servername);
        $user=$_POST["nickname"];
        $pass=$_POST["password"];
        if(isset($user)&&isset($pass))
            {
                if($user==$userdb && $pass==$passdb)
                    {
                    header('Location:loginPage.php');
                    }
            }