How to check session variable is empty ?

[eluser]bigtony[/eluser]
[quote author="wiredesignz" date="1254233737"]You are both incorrect because you cannot run the isset() function on a function no matter what.[/quote]
Thanks, but I had already corrected my previous oversight (post #7). My point abut isset is correct though, as indicated by the following:

Code:

$x = FALSE;
if (isset($x)):
    print 'set';
else:
    print('not set');
endif;

The above will display 'set' even though $x is false, which is what you get from userdata if the session variable is not found.