• 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>