public function login($user_name, $user_password) {
        $sql = "
            SELECT *
            FROM users
            LEFT JOIN `privileges`
            ON `privileges`.privileges_id = users.user_privileges
            WHERE user_name = :user AND user_ban = 0";

        $params = array(
            ':user' => array(
                'param' => (string) $user_name,
                'type' => 2
            )
        );

        $this->_databaseInstance->query($sql, $params, 2);

        if (empty($this->_databaseInstance->getCount())) {
            // 201 Несъществуващо име.
            $this->_errors[201] = 1;
            return FALSE;
        }

        $user_credentials = $this->_databaseInstance->getResult()[0];

        if (!password_verify($user_password, $user_credentials['user_password'])) {
            // 202 Грешна парола.
            $this->_errors[201] = 1;
            return FALSE;
        }
        unset($user_credentials['user_password']);

        return $user_credentials;
    }