NOTE --- This is a partial match, the whole line on a fresh installation looks like this:
function submit_post($mode, &$post_data, &$message, &$meta, &$forum_id, &$topic_id, &$post_id, &$poll_id, &$topic_type, &$bbcode_on, &$html_on, &$smilies_on, &$attach_sig, &$bbcode_uid, &$post_username, &$post_subject, &$post_message, &$poll_title, &$poll_options, &$poll_length)