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Hello,

Is there a way to represent numeric values as fixed point decimals in PHP? If not, why was this datatype not added?

I think is very important to have fixed point decimals when working with money values. This would make it much easy than having to use the BCMath functions.

If PHP had support for operator overloading then we could have easily implemented this datatype as a class:

$a = new FixPoint(34.56, 2);
$b = new FixPoint(34.55, 2);

$c = $a-$b;
echo ($c);

$c+= 3;
echo $c;
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I may be over-simplifying or not completely understanding fixed point =
decimals, but would number_format work?

Take care,
Floyd

On Dec 17, 2009, at 9:21 AM, Raymond Irving wrote:

> Hello,
>
> Is there a way to represent numeric values as fixed point decimals in =
PHP? If not, why was this datatype not added?
>
> I think is very important to have fixed point decimals when working =
with money values. This would make it much easy than having to use the =
BCMath functions.
>
> If PHP had support for operator overloading then we could have easily =
implemented this datatype as a class:
>
> $a =3D new FixPoint(34.56, 2);
> $b =3D new FixPoint(34.55, 2);
>
> $c =3D $a-$b;
> echo ($c);
>
> $c+=3D 3;
> echo $c;


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On Thu, Dec 17, 2009 at 7:49 AM, Floyd Resler <fresler [at] adex-intl.com> wrote:
> I may be over-simplifying or not completely understanding fixed point decimals, but would number_format work?
>
> Take care,
> Floyd
>

Over-simplifying just a touch...
http://en.wikipedia.org/wiki/Floating_point_error#Accuracy_p roblems

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On Thu, Dec 17, 2009 at 7:21 AM, Raymond Irving <xwisdom [at] yahoo.com> wrote:
> Hello,
>
> Is there a way to represent numeric values as fixed point decimals in PHP? If not, why was this datatype not added?
>
> I think is very important to have fixed point decimals when working with money values. This would make it much easy than having to use the BCMath functions.
>
> If PHP had support for operator overloading then we could have easily implemented this datatype as a class:
>
> $a = new FixPoint(34.56, 2);
> $b = new FixPoint(34.55, 2);
>
> $c = $a-$b;
> echo ($c);
>
> $c+= 3;
> echo $c;

A lack of operator overloading wouldn't stop me if I really needed
such a datatype. Besides, I'd be willing to bet a class (or several)
have already been made.

There is also a problem with your example usage of FixPoint. By
initializing the FixPoint with a float you are still at risk for
rounding errors. It would be better to initialize a FixPoint from
integers or a string if accuracy is truly paramount.

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