WordPress 获取评论与当前分类的根分类id函数

$comments = get_comments('number=10&status=approve');
$true_comment_count = 0;
foreach($comments as $comment) :
    $comment_type = get_comment_type();
    if($comment_type == 'comment') {
        $true_comment_count = $true_comment_count +1;
        $comm_title = get_the_title($comment->comment_post_ID);
        $comm_link = get_comment_link($comment->comment_ID);
        $comm_comm_temp = get_comment($comment->comment_ID,ARRAY_A);
        $comm_content = $comm_comm_temp['comment_content'];
?>

include (TEMPLATEPATH . '/recent_comments.php'); ?>

function get_category_root_id($cat)
{
 $this_category = get_category($cat);  // 取得当前分类
 while($this_category->category_parent)   // 若当前分类有上级分类时，循环
 {
  $this_category = get_category($this_category->category_parent);   // 将当前分类设为上级分类（往上爬）
 }
 return $this_category->term_id; // 返回根分类的id号
}
 
function fengzx_get_category_ID() {
 $category = get_the_category();
 return $category[0]->cat_ID;
}