A1_Core::login PHP Method

    public function login($username, $password, $remember = FALSE)
    {
        if (empty($password)) {
            return FALSE;
        }
        $user = is_object($username) ? $username : $this->_load_user($username);
        if (!$user->loaded()) {
            return FALSE;
        }
        if (isset($this->_config['columns']['failed_attempts']) and isset($this->_config['columns']['last_attempt']) and count(Arr::get($this->_config, 'rate_limits', array()))) {
            // rate limiting active
            $attempt = 1 + (int) $this->_get_failed_attempts($user);
            $last = isset($user->{$this->_config['columns']['last_attempt']}) ? $user->{$this->_config['columns']['last_attempt']} : NULL;
            if ($attempt > 1 and !empty($last)) {
                ksort($this->_config['rate_limits']);
                foreach (array_reverse($this->_config['rate_limits'], TRUE) as $attempts => $time) {
                    if ($attempt > $attempts) {
                        if ($last + $time > time()) {
                            // user has to wait some more before being allowed to login again
                            throw new A1_Rate_Exception('Login not allowed. Rate limit active', $last + $time);
                        } else {
                            break;
                        }
                    }
                }
            }
        }
        return $this->check_password($user, $password) ? $this->complete_login($user, $remember) : $this->failed_login($user);
    }