gistfile1.txt

	/**
	 * Authenticate a user (Check various conditions for the user that might invalidate its authentication, eg. password match, domain, IP, etc.)
	 *
	 * @param array $user Data of user.
	 *
	 * @return integer >= 200: User authenticated successfully.
	 *                         No more checking is needed by other auth services.
	 *                 >= 100: User not authenticated; this service is not responsible.
	 *                         Other auth services will be asked.
	 *                 > 0:    User authenticated successfully.
	 *                         Other auth services will still be asked.
	 *                 <= 0:   Authentication failed, no more checking needed
	 *                         by other auth services.
	 */