protected static function getIp($host)
    {
        if (!isset(self::$_dns[$host])) {
            self::$_dns[$host] = gethostbyname($host);
        }
        return self::$_dns[$host];
    }
protected static function getIp($host)
    {
        if (!isset(self::$_dns[$host])) {
            self::$_dns[$host] = gethostbyname($host);
        }
        return self::$_dns[$host];
    }
protected static function getIp ( $ host ) { if ( ! isset ( self :: $ _dns [ $ host ] ) ) { self :: $ _dns [ $ host ] = gethostbyname ( $ host ) ; } return self :: $ _dns [ $ host ] ; }
get ip address
get ip address