PHP中文分词，自动获取关键词

    <?php
    header("Content-Type:text/html; charset=utf-8");
    define('APP_ROOT', str_replace('\\', '/', dirname(__FILE__)));
    $test = '这里是一段中文测试代码!';
    function get_tags_arr($title)
        {
            require(APP_ROOT.'/pscws4.class.php');
            $pscws = new PSCWS4();
            $pscws->set_dict(APP_ROOT.'/scws/dict.utf8.xdb');
            $pscws->set_rule(APP_ROOT.'/scws/rules.utf8.ini');
            $pscws->set_ignore(true);
            $pscws->send_text($title);
            $words = $pscws->get_tops(5);
            $tags = array();
            foreach ($words as $val) {
                $tags[] = $val['word'];
            }
            $pscws->close();
            return $tags;
    }
    print_r(get_tags_arr($test));
//============================================================
    function get_keywords_str($content){
        require(APP_ROOT.'/phpanalysis.class.php');
        PhpAnalysis::$loadInit = false;
        $pa = new PhpAnalysis('utf-8', 'utf-8', false);
        $pa->LoadDict();
        $pa->SetSource($content);
        $pa->StartAnalysis( false );
        $tags = $pa->GetFinallyResult();
        return $tags;
    }
    print(get_keywords_str($test));