Answered: new variable create?

The function qa_opt() can be used for both setting and getting an option value.

qa_opt('site_titlex', 'test forum ...')  # set value
$var = qa_opt('site_titlex')             # get value

Options are stored in the database table qa_options:

MariaDB db]> describe qa_options;
+---------+----------------+------+-----+---------+-------+
| Field   | Type           | Null | Key | Default | Extra |
+---------+----------------+------+-----+---------+-------+
| title   | varchar(40)    | NO   | PRI | NULL    |       |
| content | varchar(12000) | NO   |     | NULL    |       |
+---------+----------------+------+-----+---------+-------+
2 rows in set (0.01 sec)

so you could also manually add an option to the database

INSERT INTO qa_options VALUES ('site_titlex', 'test forum ...');

and then just use qa_opt('site_titlex') in Q2A.