使用Discuz关键词服务器实现PHP中文分词

/**
 * DZ在线中文分词
 * @param $title string 进行分词的标题
 * @param $content string 进行分词的内容
 * @param $encode string API返回的数据编码
 * @return  array 得到的关键词数组
 */
 function dz_segment($title = '', $content = '', $encode = 'utf-8'){
    if($title == ''){
        return false;
    }
    $title = rawurlencode(strip_tags($title));
    $content = strip_tags($content);
    if(strlen($content)>2400){ //在线分词服务有长度限制
        $content =  mb_substr($content, 0, 800, $encode);
    }
    $content = rawurlencode($content);
    $url = 'http://keyword.discuz.com/related_kw.html?title='.$title.'&content='.$content.'&ics='.$encode.'&ocs='.$encode;
    $xml_array=simplexml_load_file($url);                        //将XML中的数据,读取到数组对象中 
    $result = $xml_array->keyword->result;
    $data = array();
    foreach ($result->item as $key => $value) {
            array_push($data, (string)$value->kw);
    }
    if(count($data) > 0){
        return $data;
    }else{
        return false;
    }
 }

http://keyword.discuz.com/related_kw.html?title=高三历史全程复习精品教程&content=&ics=utf-8&ocs=utf-8

<?xml version="1.0" encoding="utf-8" ?>
<total_response>
 <svalid>36000</svalid>
 <keyword>
 <info>
  <count>1</count>
  <errno>0</errno>
  <nextuptime>1291287160</nextuptime>
  <keep>0</keep>
 </info>
 <result>
  <item>
   <kw><![CDATA[高三历史]]></kw>
  </item>
 </result>
 </keyword>
</total_response>