- https://www.interviewbit.com/
- https://www.fullstack.cafe/blog/php-interview-questions
- https://interviewing.io/
- https://github.com/learning-zone/php-interview-questions
session vs cookie
- https://medium.com/@rawat.hemant27/what-is-the-difference-between-cookie-cache-and-session-d6f468a9b4b3