function RealIPToHex($ip)
{
    $ar = explode('.', $ip);
    if (count($ar)<>4) return false;
    foreach($ar as $k=>$v)
    {
        $dh = dechex($ar[$k]);
        if (strlen($dh)==1) $sp = '0';
        else $sp='';
        $ar[$k] = $sp.$dh;
    }
    return implode('', $ar);
}

function HexToRealIP($hip)
{
    for($i=0;$i<4;$i++) $ar[$i] = substr($hip,2*$i,2);
    foreach($ar as $k=>$v)
    {
        $ar[$k] = base_convert($ar[$k],16,10);
    }
    return implode('.', $ar);
}

private static function IP2Hex($ip)
{
    return sprintf('%08s',dechex(ip2long($ip)));
}
private static function Hex2IP($ip)
{
    return long2ip(hexdec($ip));
}