Moron question: What is the & in a class meant to do?

I'm a bit confused.  I keep stealing code and using it for my own devious
purposes and parts of it I don't understand.  What is the "&" in a piece of
code that looks like this meant to do?  I looked all through the Class stuff
in the docs but can't seem to find the reason for it.

$foo = &$bar->some_function();

Thanks in advance,  John

---------------------
John Asendorf - jasendorf@xxxxxxxxxxx
Web Applications Developer
http://www.lcounty.com - NEW FEATURES ADDED DAILY!
Licking County, Ohio, USA
740-349-3631
Nullum magnum ingenium sine mixtura dementiae fuit

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