[BNM] php rounding bizzarreness

[Ali]

have you tried number_format($vat,2); 

maybe this rounds differently to round on your version?

both round your example DOWN on my PHP 4.3.11!

subtotal=170.20
VAT=29.785
Total=199.985

Rounded VAT=29.78
Rounded Total=199.98

Formatted VAT=29.78
Formatted Total=199.98


Ali
  ----- Original Message ----- 
  From: 'Alex' Bridge 
  To: Brighton New Media 
  Sent: Thursday, March 09, 2006 3:45 PM
  Subject: Re: [BNM] php rounding bizzarreness


  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

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