// 打开 /include/arc.archives.class.php 文件，在修改最后的两个方法，按下面的方法进行修改。
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);

    $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;
}

// 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);
    $string = str_replace($words, $result, $string);
    return $pre.$string;
}