여러게시판의 최신글 받아오는데 질문있습니다.

function latest_all($skin_dir='', $bo_tables, $rows=10, $subject_len=40, $cache_time=1, $options=''){     global $g5;     if (!$skin_dir) $skin_dir = 'basic';     if(preg_match('#^theme/(.+)$#', $skin_dir, $match)) {        if (G5_IS_MOBILE) {            $latest_skin_path = G5_THEME_MOBILE_PATH.'/'.G5_SKIN_DIR.'/latest/'.$match[1];            if(!is_dir($latest_skin_path))                $latest_skin_path = G5_THEME_PATH.'/'.G5_SKIN_DIR.'/latest/'.$match[1];            $latest_skin_url = str_replace(G5_PATH, G5_URL, $latest_skin_path);        } else {            $latest_skin_path = G5_THEME_PATH.'/'.G5_SKIN_DIR.'/latest/'.$match[1];            $latest_skin_url = str_replace(G5_PATH, G5_URL, $latest_skin_path);        }        $skin_dir = $match[1];    } else {        if(G5_IS_MOBILE) {            $latest_skin_path = G5_MOBILE_PATH.'/'.G5_SKIN_DIR.'/latest/'.$skin_dir;            $latest_skin_url  = G5_MOBILE_URL.'/'.G5_SKIN_DIR.'/latest/'.$skin_dir;        } else {            $latest_skin_path = G5_SKIN_PATH.'/latest/'.$skin_dir;            $latest_skin_url  = G5_SKIN_URL.'/latest/'.$skin_dir;        }    }         $list = array();        $sql_common = " from {$g5['board_new_table']} a  where find_in_set(a.bo_table, '{$bo_tables}')";        $sql_common .= " and a.wr_id = a.wr_parent ";        $sql_order = " order by a.bn_id desc ";        $sql = " select a.* {$sql_common} {$sql_order} limit 0, {$rows}";         $result = sql_query($sql);                for ($i=0; $row=sql_fetch_array($result); $i++) {             $sql = " select * from {$g5['board_table']} where bo_table = '{$row['bo_table']}' ";            $board = sql_fetch($sql);             $tmp_write_table = $g5['write_prefix'] . $row['bo_table'];            $row2 = sql_fetch(" select * from {$tmp_write_table} where wr_id = '{$row['wr_id']}' ");             $list[$i] = $row2;            $list[$i] = get_list($row2, $board, $latest_skin_url, $subject_len);            $list[$i]['bo_subject'] = $row['bo_subject'];            $list[$i]['bo_table'] = $row['bo_table'];        }     ob_start();    include $latest_skin_path.'/latest.skin.php';    $content = ob_get_contents();    ob_end_clean();     return $content;}

echo latest_all("basic",'notice,Testimony',5,20);