class USER {
        public $login;
        public $password;
        public $data;
        function get_pdo ()
        {
            global $pdo;
            return $pdo;
        }
        function check_user($login,$password)
        {
            $pdo = get_pdo();
            $stmt = $pdo->prepare("SELECT * FROM users WHERE login = :login");
            $stmt->bindParam(":login",$login);
            if($stmt->execute())
            {
               while($row = $stmt->fetch(PDO::FETCH_LAZY))
               {
                   $bd_login = $row['login'];
                   $bd_password = $row['pass'];
                   if($password == $bd_password)
                       return 1;
                   else
                       return 0;
               }
            }else
                header("Location:404.php");
        }
        function reg_new_user($login,$password,$reg_date,$nickname)
        {
            if(check_user(login,password) == 0)
            {
                $stmt = $pdo->prepare("INSERT INTO users (login, pass,regdate,nickname) VALUES (:login,:pass,:regdate,:nickname)");
                $stmt->bindParam(':login', $login);
                $stmt->bindParam(':pass', $password);
                $stmt->bindParam(':regdate', $reg_date);
                $stmt->bindParam(':nickname', $nickname);
                if($stmt->execute())
                {
                    $_SESSION['check'] = true;
                    $_SESSION['name'] = $nickname;
                    header("location:vce.php");
                }else
                    header("Location:404.php");
            }
            else
                echo "<script>alert('Пользователь с такими данными уже зарегестрирован!');</script>";
        }
    }
    if(isset($_POST['reg']))
    {
        $user = new USER;
        $user->reg_new_user($_POST['login'],$_POST['password'],$start = date('M-d H:i', time() + 10800),$_POST['nickname']);
    }