/**

* 获取文章的评论人数 
*$postid:文章id
*$which:返回类型（0或1）为0时返回评论人数，为1时返回评论条数
*/
function count_comments($postid=0,$which=0) {
	$comments = get_comments('status=approve&type=comment&post_id='.$postid); //获取文章的所有评论
	if ($comments) {
		$i=0; $j=0; $commentusers=array();
		foreach ($comments as $comment) {
			++$i;
			if ($i==1) { $commentusers[] = $comment->comment_author_email; ++$j; }
			if ( !in_array($comment->comment_author_email, $commentusers) ) {
				$commentusers[] = $comment->comment_author_email;
				++$j;
			}
		}
		$output = array($j,$i);
		$which = ($which == 0) ? 0 : 1;
		return $output[$which]; //返回评论人数
	}
	return 0; //没有评论返回0
}