Installation and configuration of CMS Celena

Minimum CMS requirements:

MySql >= 5.7.8

MariaDB >= 10.2

PHP >= 8.1

If you have 2.3.5 MySql  5.7.8, there may be an error about something about sql_mode=only_full_group_by, or other errors, go to the database and make an SQL query:

SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));