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;