DedeCMS通过Tag和Keyword标签获取相关文章的方法

DedeCMS默认自带的相关文章是likearticle标签实现，实际应用的时候发现这个标签调用的相关文章并不完美，我们需要改进下，一般我们要调用相关文章都是以Tag或者keyword匹配，我们今天就做下改进，实现全站按TAG和关键字调用相关文章，这个方法可单用tag来调用相关文章，也可用tag+keyword来调用相关文章(默认tag优先于keyword，可以自己排序)，非常适合SEO，经测试效果极佳。

具体方法如下：

把下面的php代码换掉include/taglib/likearticle.lib里的代码：

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();
 
  $typeid = ( !empty($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) && !ereg(',', $typeid) ) {
      $typeid = GetSonIds($typeid);
  }
  if(!empty($refObj->Fields['tags']) && $eregtype != 'keyword' )
  {
    $tags = explode(',', addslashes($refObj->Fields['tags']));
                             
    $getsql = " tag like '".join("' OR tag like '", $tags)."' ";
                             
    $dsql->Execute('me', "Select * From `dede_tagindex` where $getsql ");
    while($arow = $dsql->GetArray('me')) {
      $tids[] = $arow['id'];
    }
    $tid = join(',', $tids);
    if($tid!='')
    {
      $dsql->Execute("me", "Select aid From `dede_taglist` where tid in($tid) And arcrank > -1 group by aid order by aid desc limit 0, $row");
      while($arow = $dsql->GetArray("me"))
      {
        $ids[] = $arow['aid'];
                                                                $arcid = $refObj->Fields['aid'];
      }
    }
  }
 
  if($eregtype == 'tag' && count($ids) == 0 )
  {
    return '';
  }
  else
  {
    if(count($ids) > 0)
    {
                                  if(!empty($typeid)) {
            $typeid = " And arc.typeid in($typeid) And arc.id<>$arcid ";
        }
      $idsStr = join(',', $ids);
      $query = "Select arc.*,tp.typedir,tp.typename,tp.corank,tp.isdefault,tp.defaultname,tp.namerule,
                        tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath
                        from `dede_archives` arc left join `dede_arctype` tp on arc.typeid=tp.id
                        where arc.id in($idsStr) $typeid order by arc.id desc";
    }
    else
    {
  $limitRow = $row - count($ids);
  $keyword = '';
  if(!empty($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 ) {
    $orderquery = " order by arc.id desc ";
  }
  else {
    $orderquery = " order by ABS(arc.id - ".$arcid.") ";
    }
  if($keyword != '')
  {
        if(!empty($typeid)) {
            $typeid = " And arc.typeid in($typeid) And arc.id<>$arcid ";
        }
        $query = "Select arc.*,tp.typedir,tp.typename,tp.corank,tp.isdefault,tp.defaultname,tp.namerule,
                        tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath
                        from `dede_archives` arc left join `dede_arctype` tp on arc.typeid=tp.id
                        where arc.arcrank>-1 and ($keyword) $typeid $orderquery limit 0, $row";
  }
  else
  {
      if(!empty($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 arc.arcrank>-1 and $typeid $orderquery limit 0, $row";
                                      }
                            }
                      }
  $innertext = trim( $ctag->GetInnerText() );
  if($innertext=='') $innertext = GetSysTemplets('part_arclist.htm');
  $dsql->SetQuery($query);
  $dsql->Execute('al');
    $artlist = '';
  if($col > 1) {
    $artlist = " ";
  }
  $dtp2 = new DedeTagParse();
  $dtp2->SetNameSpace('field', '[', ']');
  $dtp2->LoadString($innertext);
  $GLOBALS['autoindex'] = 0;
  $line = $row;
  for($i=0; $i < $line; $i++)
  {
    if($col>1) $artlist .= " ";
    for($j=0; $j < $col; $j++)
    {
      if($col>1) $artlist .= "  ";
    }
    //Loop Col
    if($col>1) $i += $col - 1;
    if($col>1) $artlist .= "  ";
  }
  //loop line
  if($col>1) $artlist .= " 
 ";
      if($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'] = $GLOBALS['cfg_cmspath'].'/images/defaultpic.gif';
        }
        if(!eregi("^http://",$row['litpic']) && $GLOBALS['cfg_multi_site'] == 'Y')
        {
          $row['litpic'] = $GLOBALS['cfg_mainsite'].$row['litpic'];
        }
        $row['picname'] = $row['litpic'];
        $row['stime'] = GetDateMK($row['pubdate']);
        $row['typelink'] = "".$row['typename']."";
        $row['image'] = "";
        $row['imglink'] = "".$row['image']."";
        $row['fulltitle'] = $row['title'];
        $row['title'] = cn_substr($row['title'],$titlelen);
        if($row['color']!='') $row['title'] = "".$row['title']."";
        if(ereg('b',$row['flag'])) $row['title'] = "".$row['title']."";
        $row['textlink'] = "".$row['title']."";
        $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()." ";
      }
      //if hasRow
      else
      {
        $artlist .= '';
      }
      if($col>1) $artlist .= " 
 ";
  $dsql->FreeResult("al");
  return $artlist;
}
?>

调用代码为：

{dede:likearticle col=‘2’ row=‘8’ titlelen=‘48’ mytypeid=‘4’ eregtype=all|tag|keyword}

[field:title/]

{/dede:likearticle}

代码释义：

eregtype属性

eregtype = keyword 只匹配关键字

eregtype = tag 只匹配tag

eregtype = all tag优先，不存在tag则匹配关键字

mytypeid=’’ 栏目ID,多个栏目用,隔开