SEO的两个函数：分词，优化

//根据标题获得百度热门相关关键字，返回字符串

以下是引用片段：
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($w);
//获得列表部分
preg_match_all("|
(.*)
|isU",$w,$con);
$list=$con[1][0];
//获得具体内容
("|<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);<br />
//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;
}

以下是引用片段：
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;
}

为什么搜索引擎（百度）不收录我的网站首页

Title标签网站排名的作用 SEO中TITLE作用分析