How do I deactivate caching in browsers?

Question

For instance, if you exit your Yahoo mail and then click the back button, it will not load the last page, it will redirect you to the login page.

I have to do this with

Answer 1

The simple answer to avoid caching on the client browsers is to configure the Cache-Control HTTP response header.

http://en.wikipedia.org/wiki/List_of_HTTP_header_fields#Avoiding_caching

However, I don't have a PHP snippet with me to show you how to do it exactly. It should as simple getting the HTTP response object, and setting a header "Cache-Control" with value "no-store, must-revalidate"