- https://medium.com/solvup-tech/php-best-practices-with-psr-standards-d960498e1cd0
psr-0
- https://www.php-fig.org/psr/psr-0/
psr-1
- https://www.php-fig.org/psr/psr-1/
psr-2
- https://www.php-fig.org/psr/psr-2/
\<Vendor Name>\(<Namespace>\)*<Class Name>