class blahblah....

   $this->foofunc_options = array();

function add_foofunc_option($key, $value) { 
    this->foofunc_options["$key"] = $value;
}

function foofunc($args) {
  extract $args;
  do_stuff;
}


add_foofunc_option('action', 'dullerfnask');
add_foofunc_option('method', 'havegrød');

$this->foofunc($this->foofunc_options);