Book to learn about PHP/MySQL for Nextcloud user?

Hi everyone,

As a nextcloud user I would like to know more about PHP and databases used in NExtcloud.

Could anybody recommend a good book for learning basics about these subjects ?


Do you want to learn somethink about PHP and MariaDB or Nextcloud?

For the programming it is not only PHP and MariaDB it is:
LAMP (Linux, Apache2, MySQL/MariaDB, PHP/Perl/Python)

For Nextcloud you can read the source code:

Also you need knowledge about HTML, CSS and Javascript.