Dedecms关键词维护：优先处理字数多的词而非字数少的词的解决方法

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>)#isU", '\\1-]-\\4-[-\\6', $body);

    /*
    foreach($kws as $k)
    {
        $k = trim($k);
        if($k!="")
        {
            if($i > $maxkey)
            {
                break;
            }
            $myrow = $this->dsql->GetOne("SELECT * FROM #@__keywords WHERE keyword='$k' AND rpurl<>' ' ");
            if(is_array($myrow))
            {
                $karr[] = $k;
                $GLOBALS['replaced'][$k] = 0;
                $kaarr[] = "$k";
            }
            $i++;
        }
    }
    */
    $query = "SELECT * FROM #@__keywords WHERE rpurl<>' ' ORDER BY rank DESC";
    $this->dsql->SetQuery($query);
    $this->dsql->Execute();
    while($row = $this->dsql->GetArray())
    {
        $key = trim($row['keyword']);
        $key_url=trim($row['rpurl']);
        $karr[] = $key;
        $kaarr[] = "$key";
    }

    // 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("#()#isU", '\\1>\\3<\\4', $body);
    return $body;
}
    

function ReplaceKeyword($kw,&$body)
{
    global $cfg_cmspath,$dsql;
    $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>)/isU", '\\1-]-\\4-[-\\6', $body);
    $query="SELECT * FROM #@__keywords WHERE rpurl<>'' and sta=1 ORDER BY length(keyword)desc";
    $dsql->SetQuery($query);
    $dsql->Execute();
    while($row = $dsql->GetArray())
    {
        $key = trim($row['keyword']);
        $key_url=trim($row['rpurl']);
        $karr[] = $key;
        $kaarr[] = "$key";
    }
    foreach ($karr as $key => $word)
    {
        $body = preg_replace("/(^|>)([^<]+)(?=<|$)/sUe", "_highlight('\\2', \\$karr[$key], \\$kaarr[$key],'\\1')", $body);
        //恢复超链接
        $body = preg_replace("/()/isU", '\\1>\\3<\\4', $body);//暂时屏蔽超链接
        $body = preg_replace("/()(.*)(<)(/a>)/isU", '\\1-]-\\4-[-\\6', $body);
    }
    //恢复超链接
    $body = preg_replace("/()/isU", '\\1>\\3<\\4', $body);
    return $body;
}

//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('\\\\\\"', '\\"', $string);
    if($GLOBALS['replaced'][$words] == 1){
        return $pre.$string;
    }
    if($cfg_replace_num > 0){
        $string = preg_replace("/".preg_quote($words)."/", $result, $string, $cfg_replace_num);
        if(strpos($string, $words) !== false)
        {
            $GLOBALS['replaced'][$words] = 1;
        }
    }
    else{
        $string = str_replace($words, $result, $string);
    }
    return $pre.$string;
}