if( empty($arcid) || $byabs==0 ) {
   $orderquery = " order by arc.id desc ";
}
else {
   $orderquery = " order by ABS(arc.id - ".$arcid.") ";
}
likearticle标签默认的排序方式。赋予标签orderby属性那么这段代码就没意义了，先在源码中注释掉这段代码
直接延用默认的order by 子句变量$orderquery,这样sql语句就不用做更改了。
创建新变量 orderquery='';//mysql 查询语句中的order by子句 初始为空
然后根据传递的值做相应的判断，在这里只做一些最常用的值的判断
根据$orderby的值做不同的orderby 查询
if($orderby=='hot' || $orderby=='click') $orderquery = " order by arc.click $orderWay";
else if($orderby == 'sortrank' || $orderby=='pubdate') $orderquery = " order by arc.sortrank $orderWay";
else if($orderby == 'id') $orderquery = " order by arc.id $orderWay";
else if($orderby == 'near') $orderquery = " order by ABS(arc.id - ".$arcid.")";
else if($orderby == 'lastpost') $orderquery = " order by arc.lastpost $orderWay";
else if($orderby == 'scores') $orderquery = " order by arc.scores $orderWay";
else if($orderby == 'rand') $orderquery = " order by rand()";
else if($orderby == 'weight') $orderquery = " order by arc.weight asc";//如果没有特定设置排序则按照权重先排序
else $orderquery = " order by arc.sortrank $orderWay";

ok这样就为likearticle标签增加了完整的order by 属性
2.subday属性（标签获取subday指定的最近几天的数据）
同样先获得subday 的属性值
$subday=$ctag->GetAtt('subday');
然后做时间差计算
if($subday > 0)
   {
    $ntime = gmmktime(0, 0, 0, gmdate('m'), gmdate('d'), gmdate('Y'));
    $limitday = $ntime - ($subday * 24 * 3600);
    $subdaysql = " and arc.senddate > $limitday ";
   }
然后在标签源码的两处sql查询语句中 增加$subdaysql子句判断
第一处为：
$query = "Select arc.*,tp.typedir,tp.typename,tp.corank,tp.isdefault,tp.defaultname,tp.namerule,
           tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath
            from `dede_archives` arc left join `dede_arctype` tp on arc.typeid=tp.id
            where arc.arcrank>-1 and ($keyword) $typeid $orderquery limit 0, $row";
修改为:
$query = "Select arc.*,tp.typedir,tp.typename,tp.corank,tp.isdefault,tp.defaultname,tp.namerule,
           tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath
            from `dede_archives` arc left join `dede_arctype` tp on arc.typeid=tp.id
            where arc.arcrank>-1 and ($keyword) $typeid $subdaysql $orderquery limit 0, $row";
第二处为：
$query = "Select arc.*,tp.typedir,tp.typename,tp.corank,tp.isdefault,tp.defaultname,tp.namerule,
           tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath
            from `dede_archives` arc left join `dede_arctype` tp on arc.typeid=tp.id
           where arc.arcrank>-1 and $typeid $orderquery limit 0, $row";
修改为：
$query = "Select arc.*,tp.typedir,tp.typename,tp.corank,tp.isdefault,tp.defaultname,tp.namerule,
           tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath
            from `dede_archives` arc left join `dede_arctype` tp on arc.typeid=tp.id
           where arc.arcrank>-1 and $typeid $subdaysql $orderquery limit 0, $row";
做完以上更改就为likearticle标签增加了subday属性
以下为修改完之后的likearticle.lib.php的完整代码（增加了 orderby 和 subday 属性）
修改之后完整文件：
 
查看源码打印代码帮助
<?php   if(!defined('DEDEINC')) exit('Request Error!'); 
/**
 * 自动关连文档标签
 *
 * @version        $Id: likearticle.lib.php 1 9:29 2010年7月6日Z tianya $
 * @package        DedeCMS.Taglib
 * @copyright      Copyright (c) 2007 - 2010, DesDev, Inc.
 * @license        http://help.dedecms.com/usersguide/license.html
 * @link           http://www.dedecms.com
 */ 
    
/*>>dede>>
<name>相关文档</name>
<type>全局标记</type>
<for>V55,V56,V57</for>
<description>自动关连文档标签</description>
<demo>
{dede:likearticle row='' col='' titlelen='' infolen=''}
<a href='[field:arcurl/]'>[field:title/]</a>
{/dede:likearticle}
</demo>
<attributes>
    <iterm>col:分多少列显示（默认为单列）</iterm> 
    <iterm>row:返回文档列表总数</iterm>
    <iterm>titlelen:标题长度 等同于titlelength</iterm>
    <iterm>infolen:表示内容简介长度 等同于infolength</iterm>
    <iterm>mytypeid:手工指定要限定的栏目id，用,分开表示多个</iterm>
    <iterm>innertext:单条记录样式(指标签中间的内容)</iterm>
</attributes> 
>>dede>>*/ 
    
function lib_likearticle(&$ctag,&$refObj) 
{ 
    global $dsql; 
       
    //属性处理 
    $attlist="row|12,titlelen|28,infolen|150,col|1,tablewidth|100,mytypeid|0,byabs|0,imgwidth|120,imgheight|90<span >,start|0,orderby|null,inword|*,channelid|*</span>"; 
    FillAttsDefault($ctag->CAttribute->Items,$attlist); 
    extract($ctag->CAttribute->Items, EXTR_SKIP); 
    $revalue = ''; 
       
    if(empty($tablewidth)) $tablewidth = 100; 
    if(empty($col)) $col = 1; 
    $colWidth = ceil(100/$col); 
    $tablewidth = $tablewidth."%"; 
    $colWidth = $colWidth."%"; 
       
    $ids = array(); 
    $tids = array(); 
       
    if(!empty($refObj->Fields['tags'])) { 
        $keyword = $refObj->Fields['tags']; 
    } 
    else { 
        $keyword = ( !empty($refObj->Fields['keywords']) ? $refObj->Fields['keywords'] : '' ); 
    } 
       
    $typeid = ( !empty($mytypeid) ? $mytypeid : 0 ); 
    if(empty($typeid)) 
    { 
        if(!empty($refObj->Typelink->TypeInfos['reid'])) { 
             $typeid = $refObj->Typelink->TypeInfos['reid']; 
        } 
        else { 
             if(!empty($refObj->Fields['typeid'])) $typeid = $refObj->Fields['typeid']; 
        }                              
    }  
       
    if( !empty($typeid) && !preg_match('#,#', $typeid) ) { 
        $typeid = GetSonIds($typeid); 
    } 
       
    $limitRow = $row - count($ids); 
    $keyword = ''; 
    <span >if (empty($refObj->Fields['keywords']) && (! empty($inword)) && ($inword !='*') ) 
    { 
       $refObj->Fields['keywords'] = $inword; 
    }</span> 
    if(!empty($refObj->Fields['keywords'])) 
    { 
            $keywords = explode(',' , trim($refObj->Fields['keywords'])); 
            $keyword = ''; 
            $n = 1; 
            foreach($keywords as $k) 
            { 
                if($n > 3)  break; 
                    
                if(trim($k)=='') continue; 
                else $k = addslashes($k); 
                    
                $keyword .= ($keyword=='' ? " CONCAT(arc.keywords,' ',arc.title) LIKE '%$k%' " : " OR CONCAT(arc.keywords,' ',arc.title) LIKE '%$k%' "); 
                $n++; 
            } 
    } 
    $arcid = (!empty($refObj->Fields['id']) ? $refObj->Fields['aid'] : 0); 
    if( empty($arcid) || $byabs==0 ) 
    { 
       
        <span >switch ($orderby) 
        {//只能使用指定的列名 
          case 'typeid': 
          case 'typeid2': 
          case 'sortrank': 
          case 'channel': 
          case 'arcrank': 
          case 'click': 
          case 'title': 
          case 'shorttitle': 
          case 'writer': 
          case 'pubdate': 
          case 'senddate': 
             
          case 'keywords': 
          case 'goodpost': 
          case 'badpost': 
          case 'notpost': 
            $orderby = 'arc.' . $orderby ;//连接,要允许使用连接表必须修改 
            break; 
          default: 
             $orderby = 'arc.id'; 
        }</span> 
       
        $orderquery = " ORDER BY <span >{$orderby}</span> desc ";      
    } 
    else { 
        $orderquery = " ORDER BY ABS(arc.id - ".$arcid.") "; 
    } 
       
    <span >$start = (empty($start)?0:$start); 
       
    $channel_id = ''; 
    //echo '<br>'.$channelid.'<br>'; 
    if ( (!empty($channelid)) && preg_match("/^-?d+(,-?d+)*$/",$channelid) ) 
    {//指定频道,必须是整数序列 
      $channel_id = " channel in($channelid) and "; 
    } 
    </span> 
       
    if($keyword != '') 
    { 
             if(!empty($typeid)) { 
                     $typeid = " AND arc.typeid IN($typeid) AND arc.id<>$arcid "; 
             } 
             $query = "SELECT arc.*,tp.typedir,tp.typename,tp.corank,tp.isdefault,tp.defaultname,tp.namerule, 
                  tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath 
                  FROM `dede_archives` arc LEFT JOIN `dede_arctype` tp ON arc.typeid=tp.id 
                  where<span > $channel_id </span> arc.arcrank>-1 AND ($keyword)  $typeid $orderquery limit <span >$start</span>, $row"; 
    } 
    else 
    { 
            if(!empty($typeid)) { 
                    $typeid = " arc.typeid IN($typeid) AND arc.id<>$arcid "; 
            } 
            $query = "SELECT arc.*,tp.typedir,tp.typename,tp.corank,tp.isdefault,tp.defaultname,tp.namerule, 
                  tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath 
                  FROM `dede_archives` arc LEFT JOIN `dede_arctype` tp ON arc.typeid=tp.id 
                 WHERE <span >$channel_id</span> arc.arcrank>-1 AND  $typeid $orderquery limit <span >$start</span>,$row"; 
    } 
   // exit($query); 
       
    $innertext = trim( $ctag->GetInnerText() ); 
    if($innertext=='') $innertext = GetSysTemplets('part_arclist.htm'); 
   
    $dsql->SetQuery($query); 
    $dsql->Execute('al'); 
    $artlist = ''; 
    if($col > 1) { 
        $artlist = "<table width='$tablewidth' border='0' cellspacing='0' cellpadding='0'>rn"; 
    } 
    $dtp2 = new DedeTagParse(); 
    $dtp2->SetNameSpace('field', '[', ']'); 
    $dtp2->LoadString($innertext); 
    $GLOBALS['autoindex'] = 0; 
    $line = $row; 
    for($i=0; $i < $line; $i++) 
    { 
        if($col>1) $artlist .= "<tr>rn"; 
        for($j=0; $j < $col; $j++) 
        { 
            if($col>1) $artlist .= "    <td width='$colWidth'>rn"; 
            if($row = $dsql->GetArray("al")) 
            { 
                $ids[] = $row['id']; 
                //处理一些特殊字段 
                $row['info'] = $row['infos'] = cn_substr($row['description'],$infolen); 
                $row['id'] =  $row['id']; 
   
                if($row['corank'] > 0 && $row['arcrank']==0) 
                { 
                    $row['arcrank'] = $row['corank']; 
                } 
   
                $row['filename'] = $row['arcurl'] = GetFileUrl($row['id'],$row['typeid'],$row['senddate'],$row['title'],$row['ismake'], 
                $row['arcrank'],$row['namerule'],$row['typedir'],$row['money'],$row['filename'],$row['moresite'],$row['siteurl'],$row['sitepath']); 
   
                $row['typeurl'] = GetTypeUrl($row['typeid'],$row['typedir'],$row['isdefault'],$row['defaultname'],$row['ispart'], 
                $row['namerule2'],$row['moresite'],$row['siteurl'],$row['sitepath']); 
   
                if($row['litpic'] == '-' || $row['litpic'] == '') 
                { 
                    $row['litpic'] = $GLOBALS['cfg_cmspath'].'/images/defaultpic.gif'; 
                } 
                if(!preg_match("#^http://#i", $row['litpic']) && $GLOBALS['cfg_multi_site'] == 'Y') 
                { 
                    $row['litpic'] = $GLOBALS['cfg_mainsite'].$row['litpic']; 
                } 
                $row['picname'] = $row['litpic']; 
                $row['stime'] = GetDateMK($row['pubdate']); 
                $row['typelink'] = "<a href='".$row['typeurl']."'>".$row['typename']."</a>"; 
                $row['image'] = "<img src='".$row['picname']."' border='0' width='$imgwidth' height='$imgheight' alt='".preg_replace("#['><]#","",$row['title'])."'>"; 
                $row['imglink'] = "<a href='".$row['filename']."'>".$row['image']."</a>"; 
                $row['fulltitle'] = $row['title']; 
                $row['title'] = cn_substr($row['title'], $titlelen); 
                if($row['color']!='') $row['title'] = "<font color='".$row['color']."'>".$row['title']."</font>"; 
                if(preg_match('#b#', $row['flag'])) $row['title'] = "<strong>".$row['title']."</strong>"; 
                $row['textlink'] = "<a href='".$row['filename']."'>".$row['title']."</a>"; 
                $row['plusurl'] = $row['phpurl'] = $GLOBALS['cfg_phpurl']; 
                $row['memberurl'] = $GLOBALS['cfg_memberurl']; 
                $row['templeturl'] = $GLOBALS['cfg_templeturl']; 
                   
                if(is_array($dtp2->CTags)) 
                { 
                    foreach($dtp2->CTags as $k=>$ctag) 
                    { 
                        if($ctag->GetName()=='array') { 
                            $dtp2->Assign($k,$row); 
                        } 
                        else { 
                            if(isset($row[$ctag->GetName()])) $dtp2->Assign($k,$row[$ctag->GetName()]); 
                            else $dtp2->Assign($k,''); 
                        } 
                    } 
                    $GLOBALS['autoindex']++; 
                } 
   
                $artlist .= $dtp2->GetResult()."rn"; 
            } 
            //if hasRow 
            else 
            { 
                $artlist .= ''; 
            } 
            if($col>1) $artlist .= "    </td>rn"; 
        } 
        //Loop Col 
        if($col>1) $i += $col - 1; 
        if($col>1) $artlist .= "    </tr>rn"; 
    } 
    //loop line 
    if($col>1) $artlist .= "    </table>rn"; 
    $dsql->FreeResult("al"); 
    return $artlist; 
}