• 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