How to check session variable is empty ?

[eluser]wiredesignz[/eluser]
[quote author="bigtony" date="1254231997"]affix: You might want to do your own checking on this, but I think you may run into a problem with:

Code:

if(isset($this->session->userdata('my_var'))
etc...

This is because the userdata function returns 'false' if the variable is not set, which means that isset will return true (because 'false' is a set value).[/quote]

You are both incorrect because you cannot run the isset() function on a function no matter what.