PSR-12: Extended Coding Style

• Namespaces and classes MUST follow an “autoloading” PSR-0, PSR-4
• Class names MUST be declared in StudlyCaps/PascalCase
• CONSTANTS MUST be declared in all upper case with underscore separators
• Method names MUST be declared in camelCase
• Variable names MUST be written in camelCase and the name describe for what it is (not simply $item, better $termEntryTig)
• UTF-8
• Next file line delimiter: Unix
• Tabs: 4 Spaces

Link to PSR-12 article: https://www.php-fig.org/psr/psr-12/

Principles:

• YAGNI: You ain’t gonna need it (wiki)
• KISS: Keep It Simple, Stupid (wiki)
• DRY: Don’t Repeat Yourself (wiki)
• SOLID: (wiki)
  - Single-Responsibility-Prinzip
  - Open-Closed-Prinzip
  - Liskovsches Substitutionsprinzip
  - Interface-Segregation-Prinzip
  - Dependency-Inversion-Prinzip