Discuz! 相关帖子功能修改随机显示不依赖标签

打开 source\module\forum\forum_viewthread.php 文件，查找：

[CSS] 纯文本查看 复制代码

			if($post['tags']) {
				$post['relateitem'] = getrelateitem($post['tags'], $post['tid'], $_G['setting']['relatenum'], $_G['setting']['relatetime']);
			}

换行添加：

[CSS] 纯文本查看 复制代码

			$post['relateitem'] = getrelateitemx($post['fid'], $_G['setting']['relatenum']);

再查找：

[CSS] 纯文本查看 复制代码

function getrelateitem($tagarray, $tid, $relatenum, $relatetime, $relatecache = '', $type = 'tid') {
	$tagidarray = $relatearray = $relateitem = array();
	$updatecache = 0;
	$limit = $relatenum;
	if(!$limit) {
		return '';
	}
	foreach($tagarray as $var) {
		$tagidarray[] = $var['0'];
	}
	if(!$tagidarray) {
		return '';
	}
	if(empty($relatecache)) {
		$thread = C::t('forum_thread')->fetch_thread($tid);
		$relatecache = $thread['relatebytag'];
	}
	if($relatecache) {
		$relatecache = explode("\t", $relatecache);
		if(TIMESTAMP > $relatecache[0] + $relatetime * 60) {
			$updatecache = 1;
		} else {
			if(!empty($relatecache[1])) {
				$relatearray = explode(',', $relatecache[1]);
			}
		}
	} else {
		$updatecache = 1;
	}
	if($updatecache) {
		$query = C::t('common_tagitem')->select($tagidarray, $tid, $type, 'itemid', 'DESC', $limit, 0, '<>');
		foreach($query as $result) {
			if($result['itemid']) {
				$relatearray[] = $result['itemid'];
			}
		}
		if($relatearray) {
			$relatebytag = implode(',', $relatearray);
		}
		C::t('forum_thread')->update($tid, array('relatebytag'=>TIMESTAMP."\t".$relatebytag));
	}


	if(!empty($relatearray)) {
		rsort($relatearray);
		foreach(C::t('forum_thread')->fetch_all_by_tid($relatearray) as $result) {
			if($result['displayorder'] >= 0) {
				$relateitem[] = $result;
			}
		}
	}
	return $relateitem;
}

换行添加：

[CSS] 纯文本查看 复制代码

function getrelateitemx($fid, $relatenum)
{
    $limit = $relatenum;
    if (!$limit) {
        return '';
    }

    $hotlist=DB::fetch_all("SELECT tid,subject,fid FROM ".DB::table('forum_thread')." where fid=$fid and displayorder>=0 order by rand() LIMIT 0,$limit");
        
    return $hotlist;
}

然后到论坛后台界面设置相关帖子数量即可。