Ошибка с PDO

session_start();
 
class user 
{
 
    private $FullName;
    private $Login;
    private $password;
    private $Email;
 
    public function __construct($login) 
    {
 
        $pdo = new PDO($dsn , $user, $password , $opt);
        $query = $pdo->prepare("SELECT * FROM users WHERE login = ?");
        $query->execute(array($login));
        $row = $query->fetch();
        $this->$FullName = $row['user_name'];
        $this->$Login = $row['login'];
        $this->$password = $row['password'];
        $this->$Email = $row['email'];
 
    }
 
 
 
 
}

class user 
{
 
    private $FullName;
    private $Login;
    private $password;
    private $Email;
    public $pdo;
 
    public function __construct($login) 
    {
 
        $pdo = new PDO($dsn , $user, $password , $opt);
        $query = $pdo->prepare("SELECT * FROM users WHERE login = ?");
        $query->execute(array($login));
        $row = $query->fetch();
        $this->FullName = $row['user_name'];
        $this->Login = $row['login'];
        $this->password = $row['password'];
        $this->Email = $row['email'];
 
 
    }
 
    public function getFullName() 
    {
        return $this->Login;
    }
 
 
 
 
}

public $pdo;