[PHP] Objects and sessions

[Greg Sidelinger]

Can someone tell me how to store a class in a session var.   I want to
test to see if it has been defined and if not create it.  I'm having
problems with it right now.
 
This is what I'm trying currently
 
<?
Class a
{ 
var $temp;
 
function a() 
{ 
                                    $this->temp=1;
}
            }
 
            session_start();
 
            if ( !isset( $c )
            {
                        $c = new a();
                        session_register("a");
            }
?>
 
later on I get errors about the class functions being undefined.    Can
anyone please point me in the right direction on how to register my
objects as session vars.