Vergleich inc/class_stopforumspamchecker.php - 1.8.5 - 1.8.20

		$confidence = 0;

		$checknum = $confidence = 0;

		if(filter_var($email, FILTER_VALIDATE_EMAIL) && filter_var($ip_address, FILTER_VALIDATE_IP)) // Calls to the API with invalid email/ip formats cause issues

		if(!filter_var($email, FILTER_VALIDATE_EMAIL))

			$username_encoded = urlencode($username);
			$email_encoded    = urlencode($email);

			$check_url = sprintf(self::STOP_FORUM_SPAM_API_URL_FORMAT, $username_encoded, $email_encoded, $ip_address);

			$result = fetch_remote_file($check_url);

			if($result !== false)
			{
				$result_json = @json_decode($result);

				if($result_json != null && !isset($result_json->error))

			throw new Exception("stopforumspam_invalid_email");
		}

		if(!filter_var($ip_address, FILTER_VALIDATE_IP))
		{
			throw new Exception('stopforumspam_invalid_ip_address');
		}

		$is_internal_ip = !filter_var(
			$ip_address,
			FILTER_VALIDATE_IP,
			FILTER_FLAG_NO_PRIV_RANGE |  FILTER_FLAG_NO_RES_RANGE
		);

		if($is_internal_ip)
		{
			return false;
		}

		$username_encoded = urlencode($username);
		$email_encoded    = urlencode($email);

		$check_url = sprintf(self::STOP_FORUM_SPAM_API_URL_FORMAT, $username_encoded, $email_encoded, $ip_address);

		$result = fetch_remote_file($check_url);

		if($result !== false)
		{
			$result_json = @json_decode($result);

			if($result_json != null && !isset($result_json->error))
			{
				if($this->check_usernames && $result_json->username->appears)

					if($this->check_usernames && $result_json->username->appears)
					{
						$confidence += $result_json->username->confidence;
					}

					$checknum++;
					$confidence += $result_json->username->confidence;
				}

				if($this->check_emails && $result_json->email->appears)
				{
					$checknum++;
					$confidence += $result_json->email->confidence;
				}

					if($this->check_emails && $result_json->email->appears)
					{
						$confidence += $result_json->email->confidence;
					}

				if($this->check_ips && $result_json->ip->appears)
				{
					$checknum++;
					$confidence += $result_json->ip->confidence;
				}
				
				if($checknum > 0 && $confidence)
				{
					$confidence = $confidence / $checknum;
				}

					if($this->check_ips && $result_json->ip->appears)
					{
						$confidence += $result_json->ip->confidence;
					}

					if($confidence > $this->min_weighting_before_spam)
					{
						$is_spammer = true;
					}
				}
				else

				if($confidence > $this->min_weighting_before_spam)

					throw new Exception('stopforumspam_error_decoding');

					$is_spammer = true;

				throw new Exception('stopforumspam_error_retrieving');

				throw new Exception('stopforumspam_error_decoding');