Zed has used phpDocumentor to produce code documentation, for example:
https://scherzo.dereckson.be/doc/zed/Zed/Story/StoryChoice.html

Keruald OmniTools would benefit from such a documentation too.

We need:

• to install phpDocumentor phar
• to install graphviz package
• to ensure PHP code can call it
• to test and tweak how to call PlantUML from phpDocumentor

+ Doctum as it offers a more hierarchical and easy to browse UI.