.vimrc

function! SetWPConfig ()
  setlocal shiftwidth=4 softtabstop=4 tabstop=4 noexpandtab
  setlocal listchars=trail:·
endfunction
function! SetDrupalConfig ()
  setlocal shiftwidth=2 softtabstop=2 tabstop=2 expandtab
  setlocal listchars=tab:▸\ ,trail:·
endfunction

" Wordpress files
au BufRead,BufNewFile */wp-content/*.php call SetWPConfig()

" Drupal files
augroup module
    au BufRead,BufNewFile *.module set filetype=php | call SetDrupalConfig()
    au BufRead,BufNewFile *.install set filetype=php | call SetDrupalConfig()
    au BufRead,BufNewFile *.test set filetype=php | call SetDrupalConfig()
    au BufRead,BufNewFile */sites/all/*.php call SetDrupalConfig()
augroup END