How to check session variable is empty ?

[eluser]affix[/eluser]
bigtony's Method is correct

However I usually do

Code:

if(isset($this->session->userdata('my_var'))
{
   //DO SOMETHING
}
else
{
   //DO SOMETHING ELSE
}

Both methods are correct it just depends on
1. Your personal Oppinion
2. What you will be doing