[BNM] php rounding bizzarreness

['Alex' Bridge]

Alex Farran wrote:
> Well my version of PHP (4.3.7) rounds up:
>
> vat         29.785
> vat_round   29.79
>
> total       199.985
> round_total 199.99
>
> So obviously it's changed.  I can't see how the round-to-even rule
> applies to Andy's code though.
>   

Errr...good point. That'll teach me to think I know the answer without 
looking properly.

Using a different version of PHP is probably the answer though. I just 
turned up a comment in the manual which says:

"The bankers' rounding behaviour mentioned in the notes below seems to 
have been changed to normaly rounding. 

 From the comments in http://bugs.php.net/bug.php?id=24142 it was 
changed in 4.3.0 but various bugs seem to have been introduced and it 
wasn't stable again until 4.3.5 (http://bugs.php.net/bug.php?id=25694)"

So I'd either use 4.2.x or lower (for banker's rounding) or 4.3.5 or up 
(for standard rounding).

-alx