SEO的几个函数，分词，优化(转载)

//根据标题获得百度热门相关关键字，返回字符串 
function baiduKeyword($title,$num=5,$charset="UTF-8"){ 
        
        $title=iconv($charset, "GB2312", $title); 
        $w=file_get_contents('http://d.baidu.com/rs.php?q='.urlencode($title).'&tn=baidu'); 
        //die($w); 
        //获得列表部分 
        preg_match_all("|<div id=con>(.*)</div>|isU",$w,$con); 
        $list=$con[1][0]; 
        //获得具体内容 
        preg_match_all("|<ul><li class=ls>(.*)</li><li class=kwc><a target=_blank href=(.*)>(.*)</a></li><li class=bar><img src=http://img.baidu.com/img/bar_1.gif height=6 width=(\d*) align=absmiddle vspace=5></li></ul>|isU",$list,$content); 
        //合并成数组，被搜索次数做为键值 
        $c=array_combine($content[4],$content[3]); 
        //排序 
        krsort($c); 
        //取前N条 
        $r=array_slice($c, 0, $num);   
        //转换成字符串 
        $result=implode(",", $r); 
        $result=iconv("GB2312", $charset,$result); 
        return $result; 
} 


//通过DZ获取文章关键字，输入标题和内容 即可返回5个关键字数组 
function getTags($title,$content){ 

        $subjectenc = rawurlencode(strip_tags($title)); 
        $messageenc = rawurlencode(strip_tags(preg_replace("/\[.+?\]/U", '',$content))); 
        $subjectenc =substr($subjectenc,0,60); 
        $messageenc=substr($messageenc,0,1200); 
        $data = @implode('', file("http://keyword.discuz.com/related_kw.html?title=$subjectenc&content=$messageenc&ics=utf-8&ocs=utf-8")); 
        
        $kws = array(); 
        if($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); 
                foreach($values as $valuearray) { 
                        if($valuearray['tag'] == 'kw' || $valuearray['tag'] == 'ekw') { 
                                $kw =trim($valuearray['value']);        
                                $kws[] =$kw ; 

                        } 
                } 
        } 
        return $kws; 
}