1、简化了代码。（其实就是去掉了一些用不着的变量的定义）
2、针对从INTERNIC检索到的信息过于简单，根据INTERNIC反馈的信息中的WHOIS SERVER进行进一步查询。比如，YAHOO在whois.networksolutions.com上有更详细的信息。

class whois {  

var $use_cache = 1;  
var $FROM_CACHE=0;  
var $cache_dir = "./"; // 根据你的系统自己设置

var $port = 43;  
var $MAXLEN = 100;  

// 如果你想在连接失败后自动重试，
// 设置重试次数 $MAX_RETRIES
var $MAX_RETRIES = 0;  
var $SLEEP_VAL = 1;  
var $RETRY = 0;  

var $FOUND = 0; // 查询没有结果，次值为0
var $ERROR = 0; // 查询过程中的出错次数
var $DATA_MIN = 8; // 我们至少应该获得8个字节的数据
var $DATA_COUNT = 0;  

var $WHOIS_SERVER;
var $NEW_WHOIS;
var $FURTHER_INFO = 0;


// 打开和WHOIS SERVER的SOCKET连接
// 默认的是 whois.internic.net  
function connect ($server) {
$this->RETRY=0;
while($this->RETRY <= $this->MAX_RETRIES):
$ptr = fsockopen($server, $this->port);  
if($ptr>0):  
$this->ERROR=0; // just in case we're on a retry  
return($ptr);  
else:  
$this->ERROR++;  
$this->RETRY++;  
sleep($this->SLEEP_VAL);  
endif;  
endwhile;  
}  

// 获取简单的查询结果，并以行为单位，放入数组
// 国际域名查询
function rawlookup ($query, $server) {

if(!$query):  
return( "");  
endif;

$ptr=$this->connect($server);

if($ptr):  
if(!ereg($query, "n$")):  
$query .= "n";  
endif;  
fputs($ptr, "$query");  
$i=0;  
$this->FOUND=1;  
while(!feof($ptr)):  
$array[$i]=fgets($ptr,$this->MAXLEN);  
$this->DATA_COUNT+=strlen(chop($array[$i]));  
if(eregi( "No match for", $array[$i]) || eregi ("No entries found", $array[$i])):  
$this->FOUND=0;  
elseif(eregi( "WHOIS database is down",$array[$i])):  
$this->ERROR++;  
$this->FOUND=0;  
elseif(eregi( "Please wait a while and try again",$array[$i])):  
$this->ERROR++;  
$this->FOUND=0;  
break;  
endif;  
if(eregi("Whois Server:",$array[$i])):
$this->NEW_WHOIS=trim(substr(trim($array[$i]),(strlen(trim($array[$i]))-13)*(-1)));
$this->FURTHER_INFO=1;
endif;
$i++;  
endwhile;  

fclose($ptr);  

if($this->DATA_COUNT>$this->DATA_MIN):
return($array);  
else:  
$this->ERROR++;  
endif;  
else:  
$this->ERROR++;  
endif;
}  


// 国内域名查询
function cnrawlookup ($query, $server) {  
if(!$query):  
return( "");  
endif;  

$ptr=$this->connect($server);  
if($ptr):  
if(!ereg($query, "n$")):  
$query .= "n";  
endif;  
fputs($ptr, "$query");  
$i=0;  
$this->FOUND=1;  
while(!feof($ptr)):  
$array[$i]=fgets($ptr,$this->MAXLEN);  
$this->DATA_COUNT+=strlen(chop($array[$i]));  
if(eregi( "No match for", $array[$i]) || eregi ("No entries found", $array[$i])):  
$this->FOUND=0;  
elseif(eregi( "WHOIS database is down",$array[$i])):  
$this->ERROR++;  
$this->FOUND=0;  
elseif(eregi( "Please wait a while and try again",$array[$i])):  
$this->ERROR++;  
$this->FOUND=0;  
break;  
endif;  
$i++;  
endwhile;  
fclose($ptr);  

if($this->DATA_COUNT>$this->DATA_MIN):
return($array);  
else:  
$this->ERROR++;  
endif;  
else:  
$this->ERROR++;  
endif;  
}  
};



$myWHOIS=new whois();

$thisname=$servername.$domainname;
// 根据国内域名或国际域名选择WHOIS SERVER
if (ereg(".cn$",$thisname))
{
$myWHOIS->WHOIS_SERVER="whois.cnnic.net.cn";
$array=$myWHOIS->cnrawlookup($thisname,$myWHOIS->WHOIS_SERVER);
}
else
{
$myWHOIS->WHOIS_SERVER="whois.internic.net";
//$myWHOIS->WHOIS_SERVER="whois.networksolutions.com";
$array=$myWHOIS->rawlookup($thisname,$myWHOIS->WHOIS_SERVER);
}



echo "
".$thisname."
";
echo "";
$x=0;
while ($x {
echo " $x ";
echo " $array[$x] ";
$x++;
}
echo "  
";

if (!ereg(".cn$",$thisname))
{
echo "
Furth infomation
";
$array_further=$myWHOIS->rawlookup($thisname,$myWHOIS->NEW_WHOIS);

echo "";
$x=0;
while ($x {
echo " $x ";
echo " $array_further[$x] ";
$x++;
}
echo "  
";
}

?>