How to redirect all HTTP requests to HTTPS

Question

I\'m trying to redirect all insecure HTTP requests on my site (e.g. http://www.example.com) to HTTPS (https://www.example.com). I\'m using PHP btw.

Answer 1

 Redirect 301 / https://example.com/

(worked for me when none of the above answers worked)

Bonus:

ServerAlias www.example.com example.com

(fixed https://www.example.com not found)