How get referring URL?

[eluser]einstein[/eluser]
or better use a variable in the config file.
Open config.php and place this line of code
$config['previousPage'] = "";
after that you set a value to this variable on page X
like this:
$this->config->set_item('previousPage', 'http://previous.url.com');
and retrive it on page y like this:
$this->config->item('previousPage');

This could be of help for global variable, i think this an easy and good sollution, and will help you avoid overloading the session.

As far as i know the session can handle only a few kb / session.

I hope this helps (sorry i forgot to look at the post's date)

but maybe it will help others