DZ系列都有一个在线分词工具，具体的URI地址为：" http://keyword.discuz.com/related_kw.html?title= $subjectenc&content=$messageenc&ics=$ SC[charset]&ocs=$ SC[charset]"

以本标题为例子 discuz! 2.5x 3.0x的自动tag系统是如何实现的？ ，下面为生成的uri地址： http://keyword.discuz.com/related_kw.html?title=discuz!%202.5x%203.0x%E7%9A%84%E8%87%AA%E5%8A%A8tag%E7%B3%BB%E7%BB%9F%E6%98%AF%E5%A6%82%E4%BD%95%E5%AE%9E%E7%8E%B0%E7%9A%84%EF%BC%9F&content=discuz!%202.5x%203.0x%E7%9A%84%E8%87%AA%E5%8A%A8tag%E7%B3%BB%E7%BB%9F%E6%98%AF%E5%A6%82%E4%BD%95%E5%AE%9E%E7%8E%B0%E7%9A%84%EF%BC%9F&ics=utf-8&ocs=utf-8 请求后返回的是XML格式的内容：

 <?xml version="1.0" encoding="utf-8" ?>
<total_response>
    <svalid>36000</svalid>
    <keyword>
    <info>
        <count>4</count>
        <errno>0</errno>
        <nextuptime>1291287160</nextuptime>
        <keep>0</keep>
    </info>
    <result>
        <item>
            <kw><![CDATA[的]]></kw>
        </item>
        <item>
            <kw><![CDATA[是]]></kw>
        </item>
        <item>
            <kw><![CDATA[discuz]]></kw>
        </item>
        <item>
            <kw><![CDATA[如何]]></kw>
        </item>
    </result>
    </keyword>
</total_response>

PHP具体调用代码为：

 function get_dz_tag($subject , $message){
        global $_SC;
        $subjectenc = rawurlencode(strip_tags($subject));
        $messageenc = rawurlencode(strip_tags(preg_replace("/\[.+?\]/U", '', $message)));

        $data = @implode('', file("http://keyword.discuz.com/related_kw.html?title=$subjectenc&content=$messageenc&ics=$_SC[charset]&ocs=$_SC[charset]"));

        if($data) {
            $parser = xml_parser_create();
            xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
            xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1);
            xml_parse_into_struct($parser, $data, $values, $index);
            xml_parser_free($parser);

            $kws = array();

            foreach($values as $valuearray) {
                if($valuearray['tag'] == 'kw' || $valuearray['tag'] == 'ekw') {
                    if(PHP_VERSION > '5' && $_SC['charset'] != 'utf-8') {
                        $kws[] = siconv(trim($valuearray['value']), $_SC['charset'], 'utf-8');//???????
                    } else {
                        $kws[] = trim($valuearray['value']);
                    }
                }
            }

            $return = '';
            if($kws) {
                foreach($kws as $kw) {
                    $kw = shtmlspecialchars($kw);
                    $return .= $kw.' ';
                }
                $return = trim($return);
            }
            return $return;
         }
    }

当然这只是一个在线分词工具，当然你也可以使用PHP扩展进行操作：如 scws 。

scws 有在线 api 和 扩展版两个方式：

api代码为：

 function Scws($string){
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_URL, "http://www.ftphp.com/scws/api.php");
        curl_setopt($ch, CURLOPT_POSTFIELDS, "data={$string}&respond=json");

        ob_start();
        curl_exec($ch);
        $content = ob_get_contents();
        curl_close($ch);
        ob_clean();
        $content  = json_decode($content ,true);
        return $content;    
    }

具体扩展版请参考scws文档： scws