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 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?

Answer 1

Disable caching of your page with the following code :

http://php.net/manual/en/function.header.php

<?php
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past
?>