title says it all, basically what i cant figure out how to do, is to check if a certain session value is equal to nothing. ISSET does not work for the context in this situation. Please help, i know its basic i just cant grapple it. I have searched high and low on google for what i want, but i just cant find it.
This is for security on a site that uses a session to check if the user is logged in or not. If the session does not contain a "." or value is NULL then it will re-direct to a "Please Login page".