Check this out!
I thought array_walk would be a good workaround for the session_unregister limitation of 'one variable unregistering at a time'.

<?	session_start();
	$one = 1;
	$two = 2;
	
	session_register('one','two');
	
	$foo = array('one','two');
	@array_walk($foo,'session_unregister');
	
	if(session_is_registered('one') || session_is_registered('two')){
		echo 'why?';
	}
?>

Well.. there is even a workaround for this workaround, but when you look at it, it makes you smile ironically :)

<?	function damn_unregister($what){
		session_unregister($what);
	}
	@array_walk($foo,'damn_unregister');
	if(!session_is_registered('one') && !session_is_registered('two')){
		echo 'now ok';
	}
?>

What am I missing here ?