Learn

1. Docker
2. TDD
3. PHP standard
4. PHPUnit
5. Codeception
6. Yii1.1 and Yii2

Todo

1. Issue #423
2. Issue #440
3. Issue #425

Problem

Done

1. Created PR for issue #291
2. PHPUnit doc, YouTube
3. PHP Standards: PSR-1, PSR-2 and PSR-12

Reference