What do the &= and &&= operators do?

From: Xevo (x3v0-usenet_at_yahoo.com)
Date: 08/30/04


Date: 30 Aug 2004 12:39:34 -0700

I can not find any information on what the "and equal" operators &=
and &&= do. I looked in the 'Programming Perl' book, searched
perldoc.com, and tried to google it, but to no avail. Can anyone fill
me in on how to use these strange operators?