public function loggingIn(){
        if(!empty($this->m_sUsername) && !empty($this->m_sPassword)){
            $PDO = Db::getInstance();
            $stmt = $PDO->prepare("SELECT * FROM users WHERE username = :username");
            $stmt->bindValue(":username", $this->m_sUsername, PDO::PARAM_STR);
            $stmt->execute();

            if($stmt->rowCount() > 0){
                $result = $stmt->fetch(PDO::FETCH_ASSOC);
                $password = $this->m_sPassword;
                $hash = $result['password'];

                if(password_verify($password, $hash)){
                    session_start();
                    $_SESSION["loggedIn"] = $result['usersid'];
                    $_SESSION["loggedIn"] = $result ['username'];
                    session_write_close();
                    return true;
                }else{
                    return false;
                }
            }
        }
    }