Referenties naar documentatie

PHP

https://www.php.net

https://www.w3schools.com/php/default.asp

Javascript

https://www.w3schools.com/js/default.asp

Object Oriented Programming ( OOP )

https://medium.com/@Adekola_Olawale/beginners-guide-to-object-oriented-programming-a94601ea2fbd

https://www.youtube.com/watch?v=pTB0EiLXUC8