wordpress 提取 某个category 下的 post 数据

$r = array('numberposts' => $count, 'category' => 2,//order by : 'name', 'author', 'date', 'title', 'modified', 'menu_order', 'parent', 'ID', 'rand', 'comment_count';'orderby' => $order,'order' => $order_by, 'post_type' => 'post',);$posts = get_posts($r);