php查询whois信息的方法

function whois_query($domain) {
  // fix the domain name:
  $domain = strtolower(trim($domain));
  $domain = preg_replace('/^http:///i','',$domain);
  $domain = preg_replace('/^www./i',$domain);
  $domain = explode('/',$domain);
  $domain = trim($domain[0]);
  // split the TLD from domain name
  $_domain = explode('.',$domain);
  $lst = count($_domain)-1;
  $ext = $_domain[$lst];
  // You find resources and lists 
  // like these on wikipedia: 
  //
  // http://de.wikipedia.org/wiki/Whois
  //
  $servers = array(
    "biz" => "whois.neulevel.biz","com" => "whois.internic.net","us" => "whois.nic.us","coop" => "whois.nic.coop","info" => "whois.nic.info","name" => "whois.nic.name","net" => "whois.internic.net","gov" => "whois.nic.gov","edu" => "whois.internic.net","mil" => "rs.internic.net","int" => "whois.iana.org","ac" => "whois.nic.ac","ae" => "whois.uaenic.ae","at" => "whois.ripe.net","au" => "whois.aunic.net","be" => "whois.dns.be","bg" => "whois.ripe.net","br" => "whois.registro.br","bz" => "whois.belizenic.bz","ca" => "whois.cira.ca","cc" => "whois.nic.cc","ch" => "whois.nic.ch","cl" => "whois.nic.cl","cn" => "whois.cnnic.net.cn","cz" => "whois.nic.cz","de" => "whois.nic.de","fr" => "whois.nic.fr","hu" => "whois.nic.hu","ie" => "whois.domainregistry.ie","il" => "whois.isoc.org.il","in" => "whois.ncst.ernet.in","ir" => "whois.nic.ir","mc" => "whois.ripe.net","to" => "whois.tonic.to","tv" => "whois.tv","ru" => "whois.ripn.net","org" => "whois.pir.org","aero" => "whois.information.aero","nl" => "whois.domain-registry.nl"
  );
  if (!isset($servers[$ext])){
    die('Error: No matching nic server found!');
  }
  $nic_server = $servers[$ext];
  $output = '';
  // connect to whois server:
  if ($conn = fsockopen ($nic_server,43)) {
    fputs($conn,$domain."rn");
    while(!feof($conn)) {
      $output .= fgets($conn,128);
    }
    fclose($conn);
  }
  else { die('Error: Could not connect to ' . $nic_server . '!'); }
  return $output;
}
// Some example queries:
print whois_query('jonasjohn.de');
print whois_query('example.com');
print whois_query('example.org');