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phpcms相关文章不按id排序的解决方法，打开phpcms/modules/content/classes/content_tag.class.php ；

查找 $r = $this->db->select($sql2, '*', $limit, '','','id');

替换为：$r = $this->db->select($sql2, '*', $limit, $order,'','id');  //让order参数传入查询方法。
 

模板中调用方法：

{pc:content action="relation" relation="$relation" id="$id" catid="$catid" num="5" keywords="$rs[keywords]" order="id DESC"}
{loop $data $r}
{/loop}
{/pc}

如果担心直接修改PC会影响未来升级，可以将其单独提取出来。放到模板中当作函数使用。代码如下：

<?php
/**
* 内容模型 - 相关文章标签(修正排序异常问题)
* @param $data
*/
function mk1_content_tag_relation($data) {
        $db = pc_base::load_model('content_model');
        $catid = intval($data['catid']);
        $siteids = getcache('category_content','commons');
        if(!$siteids[$catid]) return false;
        $siteid = $siteids[$catid];
        $category = getcache('category_content_'.$siteid,'commons');
        if(empty($category)) return false;
        if($category[$catid]['type']!=0) return false;
        $db->set_model($category[$catid]['modelid']);
        $order = $data['order'];
        $sql = "`status`=99";
        $limit = $data['id'] ? $data['limit']+1 : $data['limit'];
        if($data['relation']) {
                $relations = explode('|',trim($data['relation'],'|'));
                $relations = array_diff($relations, array(null));
                $relations = implode(',',$relations);
                $sql = " `id` IN ($relations)";
                $key_array = $db->select($sql, '*', $limit, $order,'','id');
        } elseif($data['keywords']) {
                $keywords = str_replace('%', '',$data['keywords']);
                $keywords_arr = explode(' ',$keywords);
                $key_array = array();
                $number = 0;
                $i =1;
                foreach ($keywords_arr as $_k) {
                        $sql2 = $sql." AND `keywords` LIKE '%$_k%'".(isset($data['id']) && intval($data['id']) ? " AND `id` != '".abs(intval($data['id']))."'" : '');
                        $r = $db->select($sql2, '*', $limit, $order,'','id');
                        $number += count($r);
                        foreach ($r as $id=>$v) {
                                if($i<= $data['limit'] && !in_array($id, $key_array)) $key_array[$id] = $v;
                                $i++;
                        }
                        if($data['limit']<$number) break;
                }
        }
        if($data['id']) unset($key_array[$data['id']]);
        return $key_array;
}
?>

在模板中，使用如下PHP代码获取即可：

{php $data = mk1_content_tag_relation(array('relation'=>$relation,'id'=>$id,'catid'=>$catid,'keywords'=>$rs['keywords'],'order'=>'id DESC','limit'=>'4')); }
{loop $data $r}
{/loop}