PHP
Bret Williams, Jonathan Bownds
Mastering PHP 7. Design, configure, build, and test professional web applications
Branko Ajzele
Patrick Rauland
Moodle 4 Security. Enhance security, regulation, and compliance within your Moodle infrastructure
Ian Wild
Moodle Security. Learn how to install and configure Moodle in the most secure way possible
Moodle Trust, Darko Miletic