[CentOS] Fwd: L9 - what is true?

Uh, again I posted on the wrong list - sorry!
- Jussi

-------- Original Message --------
Subject: L9 - what is true?
Date: Wed, 19 Oct 2011 15:01:59 +0300
From: Jussi Hirvi <listmember at greenspot.fi>
To: CentOS mailing list <centos at centos.org>

This code:

boolean(null);   ', ';
boolean(string); ', ';
boolean(integer);', ';
boolean(array);  ', ';
boolean(map);    ', ';