Help trying to understand a few bits of code.

[powerful_rogue]

Hi,

Im just trying to decipher a piece of code and im getting there slowly! There are however a few bits that im trying to get my head around and was wondering if I were to post them if anyone could just give a brief explanation of what they mean.

PHP Code:

$vboptions      =& $vbulletin->options; 


Now I know that this is a variable and if it didnt have the "&" it would mean that variable $vboptions is the same as $vbulletin->options, however im not sure what it means when it has the "=&" Ive tried searching w3school and also php.net but not having much luck location the "=&"