获取搜索引擎来源关键词php示例

<?php
//获取关键词
function GetKwd($rid,$query)
{
$wd = GetTT($rid);
parse_str($query, $out);
if(count($wd)>0)
{
while (list($key, $val) = each($out))
{
if(in_array($key,$wd))
{
$keyword=decodekeyword($val);
}
}
}
return $keyword;
}

//设置不同来源的搜索变量名
function GetTT($TID)
{
$arr=array(
"1"=>array("wd","word"),//百度搜索时候的关键字变量名
"2"=>array("q")         //谷歌搜索时候的关键字变量名
);
return $arr[$TID];
}

//编码转换
function decodekeyword($kval)
{

$charset=mb_detect_encoding($kval,array("ASCII",'UTF-8',"GB2312","GBK",'BIG5'));

if($charset!='UTF-8')
{
return iconv($charset,'UTF-8',$kval);
}
else
{
return $kval;
}
}

$log_arr['reurl']    =    urlencode($_GET['referrer']);//来源url
$tmp_reurl                 = parse_url(urldecode($log_arr['reurl']));
$kwd = '';
if(stristr($tmp_reurl['host'],'baidu') == true || stristr($tmp_reurl['host'],'BAIDU') == true){
$log_arr['lyid'] = 1;
$kwd = GetKwd(1,$tmp_reurl['query']);
}elseif (stristr($tmp_reurl['host'],'google') == true || stristr($tmp_reurl['host'],'GOOGLE') == true){
$log_arr['lyid'] = 2;
$kwd = GetKwd(2,$tmp_reurl['query']);
}

$log_arr['kwd'] = $kwd;