using vim huge version with GTK2 GUI on ubuntu 10.04

I mean to eliminate the following characters:

'$' , '-', and '>'  (ascii 36,45,62)
from php word syntax.

Neither 
:setlocal iskeyword-=$-> 
as an ex command nor
autocmd BufRead,BufNewFile *.php setlocal iskeyword-=$->
in .vimrc 
has the effects that I am looking for.

to test my efforts I invoke : set iskeyword and see the
following
:iskeyword=38,42,43,45,47-58,60-62,64-90,97-122,_,& 
where ascii 45 and 62 are still present.

What am I doing wrong?
thanks
-- 
Tim 
tim at johnsons-web.com or akwebsoft.com
http://www.akwebsoft.com

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