Save all programers! (sorry my "brazilian english")

I have a simple doubt, but i´m tired because i not found answers...
Why, inside a class, declarare $this variables in a format "var  $varname;"
before of a constructor?
And, please, what intend the "&" signal before functions name?

I know the arguments reference methods like this:
function bla(&$reference_arg)

But what's the diference of the sintax:
function &bla(&$var)

Thanks for attention

-- 
André Cupini
Programador - NeoBiz
[EMAIL PROTECTED]
http://www.neobiz.com.br

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