function get_domain($_ip)
{
$config =& SlimStatConfig::get_instance();
$hostname = SlimStat::get_host($_ip, false);
if ($hostname == $_ip) {
return $_ip;
} else {
$portions = explode(".", $hostname);
$portions = array_reverse($portions);
if (sizeof($portions) > 2 && strlen($portions[0]) == 2 && (strlen($portions[1]) == 2 || preg_match("/^(org?|com?|net?|gov|nhs|edu|mod)\$/i", $portions[1]))) {
$domain = $portions[2] . "." . $portions[1] . "." . $portions[0];
} elseif (sizeof($portions) > 1) {
$domain = $portions[1] . "." . $portions[0];
} else {
$domain = $portions[0];
}
return $domain;
//return ( preg_match( "/[0-9]{1,3}\.[0-9]{1,3}/", $domain ) ) ? $_ip : $domain;
}
}