Colorizing parenthesis #63

Hi, I'd like to assign a custom colour to the parenthesis, but I can't find the way to do it.

I've tried this on my vimrc:
autocmd BufRead,BufNewFile * syn match parens /[(){}]/ | hi parens ctermfg=red

also putting at the bottom of my vimrc:

function! PhpSyntaxOverride()
syn match parens /[(){}]/ | hi! parens ctermfg=blue
endfunction

augroup phpSyntaxOverride
autocmd!
autocmd FileType php call PhpSyntaxOverride()
augroup END

Nothing.. no way to change it. Any hint please?