if(isset($_POST['username'], $_POST['password'])){
       $username = $_POST['username'];
       $password = md5($_POST['password']);
       if(empty($username) or empty($password)){
           $error = "All Fields required";
       }else{
           $query = $pdo->prepare("SELECT * FROM users WHERE username = ? AND password = ?");
           $query->bindValue(1,$username);
           $query->bindValue(2,$password);
           $query->execute();

           $num= $query->rowCount();
           echo $num;
           if($num == 1){
               $_SESSION['logged_in'] = true;
               echo "grats";
               header('Location: index.php');
               exit();
           }else{
               $error="Invalid Creds";

           }
       }

   }