PHPCMS评论怎么用？

{if $allow_comment && module_exists('comment')}

{/if}

{pc:content action="lists" catid="$catid" num="25" order="id DESC" page="$page" moreinfo="1"}
{loop $data $r}
{php $comment_tag = pc_base::load_app_class("comment_tag", "comment"); $comment_total = $comment_tag->count(array('commentid'=>'content_'.$catid.'-'.$r[id].'-'.$modelid));}
{date('Y-m-d H:i:s',$r[inputtime])}·{$r[title]} 评论数:{if $comment_total}{$comment_total}{else}0{/if}
{/loop} 
{$pages}
{/pc}