Daylog

A journaling application built with clean architecture principles, following TDD from day one.

Motivation

This project was started as an experiment:

• to see whether it is possible to learn something new with the help of ChatGPT;
• to build something actually working, more complex than just a “Hello, World”;
• to explore how much freedom can be given to the model;
• to find out what happens if ChatGPT is used as a real development assistant;
• to check whether my own programming skills would atrophy in the process.

As a result, Daylog turned into more than just a learning sandbox.
It became a reference example of applying Clean Architecture, TDD,
and rigorous documentation practices in a PHP project.

Credits

Daylog was created in 2025 as a clean architecture / TDD learning project.
It was developed collaboratively with the help of ChatGPT (OpenAI).

Stack

• PHP 8.1+
• Fat-Free Framework (F3) in Infrastructure (DB layer), and in Presentation
• Composer, Codeception (unit/integration/functional)
• Vite for frontend (later)

Required PHP Extensions

• mbstring

Principles

• Framework-independent Domain/Application layers.

• One TDD step = one commit (Conventional Commits).

• English for code, tests, commits, and documentation.

• See /docs for charter, requirements, and use cases.

• See /docs/CONFIGURATION.md for environment and DB setup.

• See /docs/TESTING.md for testing conventions and running suites.

• See /docs/ARCHITECTURE_ERD_AND_GLOSSARY.md for architecture overview (ERD + glossary).

• See /docs/GITFLOW.md for branching model.

License

Daylog is licensed under the GNU General Public License v3.0.
See the LICENSE file for details.