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 my PHP code, I'm using CodeIgniter.
Some friends told me to disable caching but that will be a bad thing because I have a lot of images in my system and it would be bad to download them every time.
How do I do this with PHP?
Disable caching of your page with the following code :
http://php.net/manual/en/function.header.php
Try these:
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"