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PHP获取搜索关键字问题
网上找了一段代码想实现获取搜索关健字,测试了一个关健字取不了,是不是这代码无效了,还是那里有BUG?

 //取搜索来源关健字

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.hk"; //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
 $search_8="so.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);
 $so=preg_match("/\b{$search_8}\b/",$url);
 $s_s_keyword="";
// $bul=$_SERVER['HTTP_REFERER'];
 $bul=$_REQUEST["comelink"];
 //获取没参数域名
 preg_match('@^(?:http://)?([^/]+)@i',$bul,$matches);
 $burl=$matches[1]; 
 //匹配域名设置
 $curl="www.hcyf07.com";
 

 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($so)
  {//来自360
   $s_s_keyword=get_keyword($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="360:";
   $_SESSION["urlname"]=$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;
   $urlname="直接访问";
   $s_s_keyword="";
   $_SESSION["urlname"]=$urlname;
   $_SESSION["s_s_keyword"]=$s_s_keyword;
  }
  $s_urlname=$urlname;

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