//获取来自搜索引擎入站关键词

//by bbs.it-home.org

function get_keyword($url,$kw_start)

{

$start=stripos($url,$kw_start);

$url=substr($url,$start+strlen($kw_start));

$start=stripos($url,'&');

if ($start>0)

{

$start=stripos($url,'&');

$s_s_keyword=substr($url,0,$start);

}

else

{

$s_s_keyword=substr($url,0);

}

return $s_s_keyword;

}

$url=isset($_SERVER['HTTP_REFERER'])?$_SERVER['HTTP_REFERER']:'';//获取入站url。

$search_1="google.com"; //q= utf8

$search_2="baidu.com"; //wd= gbk

$search_3="yahoo.cn"; //q= utf8

$search_4="sogou.com"; //query= gbk

$search_5="soso.com"; //w= gbk

$search_6="bing.com"; //q= utf8

$search_7="youdao.com"; //q= utf8

$google=preg_match("/\b{$search_1}\b/",$url);//记录匹配情况，用于入站判断。

$baidu=preg_match("/\b{$search_2}\b/",$url);

$yahoo=preg_match("/\b{$search_3}\b/",$url);

$sogou=preg_match("/\b{$search_4}\b/",$url);

$soso=preg_match("/\b{$search_5}\b/",$url);

$bing=preg_match("/\b{$search_6}\b/",$url);

$youdao=preg_match("/\b{$search_7}\b/",$url);

$s_s_keyword="";

$bul=$_SERVER['HTTP_REFERER'];

//获取没参数域名

preg_match('@^(?:http://)?([^/]+)@i',$bul,$matches);

$burl=$matches[1];

//匹配域名设置

$curl="bbs.it-home.org";

if($burl!=$curl){

if ($google)

{//来自google

$s_s_keyword=get_keyword($url,'q=');//关键词前的字符为"q="。

$s_s_keyword=urldecode($s_s_keyword);

$urlname="谷歌：";

$_SESSION["urlname"]=$urlname;

$_SESSION["s_s_keyword"]=$s_s_keyword;

//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk

}

else if($baidu)

{//来自百度

$s_s_keyword=get_keyword($url,'wd=');//关键词前的字符为"wd="。

$s_s_keyword=urldecode($s_s_keyword);

$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk

$urlname="百度：";

$_SESSION["urlname"]=$urlname;

$_SESSION["s_s_keyword"]=$s_s_keyword;

}

else if($yahoo)

{//来自雅虎

$s_s_keyword=get_keyword($url,'q=');//关键词前的字符为"q="。

$s_s_keyword=urldecode($s_s_keyword);

//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk

$urlname="雅虎：";

$_SESSION["urlname"]=$urlname;

$_SESSION["s_s_keyword"]=$s_s_keyword;

}

else if($sogou)

{//来自搜狗

$s_s_keyword=get_keyword($url,'query=');//关键词前的字符为"query="。

$s_s_keyword=urldecode($s_s_keyword);

$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk

$urlname="搜狗：";

$_SESSION["urlname"]=$urlname;

$_SESSION["s_s_keyword"]=$s_s_keyword;

}

else if($soso)

{//来自搜搜

$s_s_keyword=get_keyword($url,'w=');//关键词前的字符为"w="。

$s_s_keyword=urldecode($s_s_keyword);

$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk

$urlname="搜搜：";

$_SESSION["urlname"]=$urlname;

$_SESSION["s_s_keyword"]=$s_s_keyword;

}

else if($bing)

{//来自必应

$s_s_keyword=get_keyword($url,'q=');//关键词前的字符为"q="。

$s_s_keyword=urldecode($s_s_keyword);

//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk

$urlname="必应：";

$_SESSION["urlname"]=$urlname;

$_SESSION["s_s_keyword"]=$s_s_keyword;

}

else if($youdao)

{//来自有道

$s_s_keyword=get_keyword($url,'q=');//关键词前的字符为"q="。

$s_s_keyword=urldecode($s_s_keyword);

//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk

$urlname="有道：";

$_SESSION["urlname"]=$urlname;

$_SESSION["s_s_keyword"]=$s_s_keyword;

}

else{

$urlname=$burl;

$s_s_keyword="";

$_SESSION["urlname"]=$urlname;

$_SESSION["s_s_keyword"]=$s_s_keyword;

}

$s_urlname=$urlname;

$s_urlkey=$s_s_keyword;

}

else{

$s_urlname=$_SESSION["urlname"];

$s_urlkey=$_SESSION["s_s_keyword"];

}

?>