php中获取关键词及所属来源搜索引擎名称的代码

有时候我们需要知道用户通过哪个搜索引擎，通过拿个关键词访问我们页面，当然js也可以实现，但这里介绍下php的实现代码。

代码如下:

GO


//获取关键词及所属来源搜索引擎名称

$search_url = isset($_GET['url'])?$_GET['url']:''; //代表传入的地址
/*$search_url = urldecode($search_url);
print_r($search_url);
*/

$cOnfig= array(
"s1"=>array(
"domain" => "google.com",
"kw" => "q",
"charset" => "utf-8"
),
"s3"=>array(
"domain" => "google.cn",
"kw" => "q",
"charset" => "utf-8"
),
"s4"=>array(
"domain" => "baidu.com",
"kw" => "wd",
"charset" => "gbk"
),
"s5"=>array(
"domain" => "soso.com",
"kw" => "q",
"charset" => "utf-8"
),
"s6"=>array(
"domain" => "yahoo.com",
"kw" => "q",
"charset" => "utf-8"
),
"s7"=>array(
"domain" => "bing.com",
"kw" => "q",
"charset" => "utf-8"
),
"s8"=>array(
"domain" => "sogou.com",
"kw" => "query",
"charset" => "gbk"
),
"s9"=>array(
"domain" => "youdao.com",
"kw" => "q",
"charset" => "utf-8"
),
);

//函数作用：从url中提取关键词。参数说明：url及关键词前的字符。
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;
}

$arr_key = array();
foreach($config as $item){
$sh = preg_match("/\b{$item['domain']}\b/",$search_url);
if($sh){
$query = $item['kw']."=";

$s_s_keyword = get_keyword($search_url,$query);
$F_Skey=urldecode($s_s_keyword);
if($item['charset']=="utf-8"){
$F_Skey=iconv( "UTF-8","gb2312//IGNORE",$F_Skey); //最终提取的关键词
}
$keys = explode(" ",$F_Skey);
$arr_key[$item['domain']] = $keys;
}
}
echo "

"; 
print_r($arr_key); 
?>