织梦dedecms让文章页关键词自动SEO内链

 /**
     * 高亮问题修正, 排除alt title <a></a>直接的字符替换
     *
     * @param string $kw
     * @param string $body
     * @return string
     */
    function ReplaceKeyword($kw,&$body)
    {
        global $cfg_cmspath;
        $maxkey = 5;
        $kws = explode(",",trim($kw));    //以分好为间隔符
        $i=0;
        $karr = $kaarr = $GLOBALS['replaced'] = array();
  
        //暂时屏蔽超链接
        $body = preg_replace("#(<a(.*))(>)(.*)(<)(\/a>)#isU", '\\1-]-\\4-[-\\6', $body);
  
        /*
        foreach($kws as $k)
        {
            $k = trim($k);
            if($k!="")
            {
                if($i > $maxkey)
                {
                    break;
                }
                $myrow = $this->dsql->GetOne("SELECT * FROM idea_keywords WHERE keyword='$k' AND rpurl<>'' ");
                if(is_array($myrow))
                {
                    $karr[] = $k;
                    $GLOBALS['replaced'][$k] = 0;
                    $kaarr[] = "<a href='{$myrow['rpurl']}'><u>$k</u></a>";
                }
                $i++;
            }
        }
        */
        $query = "SELECT * FROM idea_keywords WHERE rpurl<>'' ORDER BY keyword DESC";
        $this->dsql->SetQuery($query);
        $this->dsql->Execute();
        while($row = $this->dsql->GetArray())
        {
            $key = trim($row['keyword']);
            $key_url=trim($row['rpurl']);
            $karr[] = $key;
            $kaarr[] = "<a href='$key_url' target='_blank'><u>$key</u></a>";
        }
  
        // 这里可能会有错误
        $body = @preg_replace("#(^|>)([^<]+)(?=<|$)#sUe", "_highlight('\\2', \$karr, \$kaarr, '\\1')", $body);
  
        //恢复超链接
        $body = preg_replace("#(<a(.*))-\]-(.*)-\[-(\/a>)#isU", '\\1>\\3<\\4', $body);
        return $body;
    }
  
  
}//End Archives
  
//高亮专用, 替换多次是可能不能达到最多次
function _highlight($string, $words, $result, $pre)
{
    global $cfg_replace_num;
    $string = str_replace('\"', '"', $string);
    // if($cfg_replace_num > 0)
    // {
        // foreach ($words as $key => $word)
        // {
            // if($GLOBALS['replaced'][$word] == 1)
            // {
                // continue;
            // }
            // $string = preg_replace("#".preg_quote($word)."#", $result[$key], $string, $cfg_replace_num);
            // if(strpos($string, $word) !== FALSE)
            // {
                // $GLOBALS['replaced'][$word] = 1;
            // }
        // }
    // }
    // else
    // {
        $string = str_replace($words, $result, $string);
 //   }
    return $pre.$string;
}