>
> While wanting to implement RADIUS Gigawords I ran into the integer limit
> of php which seems to be 32bit (2^32)
>
> Anyone knows how I solve this?
>
>
You could either split larger numbers into multiple integers for simple
addition like with C's time in seconds and microseconds, or just use the
BCMath API:

http://hk.php.net/manual/en/ref.bc.php

--
Steve-o