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Date: Fri, 07 Dec 2007 17:37:13 +0000
Message-ID: <1197049033.26965.141.camel@ipso.snappymail.ca>
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Subject: Re: [PHP-DEV] Thoughts on Feature Request - Arithmetic
From: ipso@snappymail.ca (Mike)

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Yes, an easy way to handle this functionality that is safe to use with
user input would be REALLY nice.=20

Specifically for allowing users to specify custom formulas to do all
sorts of nifty stuff. Especially in reporting and payroll/commission
applications.=20

We're currently working on a reporting class where we would like the
user to able to specify custom columns in XML, ie:

$col5 =3D ($col1 / $col2) * ($col3 / $col4)

Or in our payroll application where customers want to calculate custom
commissions for sales people:

$commission =3D ($gross_sales - $gross_pay - $medical_benefits -
$chargebacks) * $employee_commission_bracket




On Fri, 2007-12-07 at 14:51 +0000, Nathan Rixham wrote:
> In-Built PHP Functions for parsing of basic arithmetic and if possible=20
> fraction to decimal and decimal to fraction
>=20
> $arithmetic_string =3D "3*5";
> echo arith($arithmetic_string); // returns float 15
>=20
> $arithmetic_string =3D "1/2";
> echo arith($arithmetic_string); // returns float 0.5
>=20
> $fraction_string =3D "1/4";
> echo fracdec($fraction_string); // returns float 0.25
>=20
> $dec_string =3D "0.5";
> echo decfrac($dec_string); // returns string "1/4"
>=20
> I've used php for years, came accross the need for this today and was=20
> suprised such a basic command wasn't there.. currently the only way I=20
> can see to do it would be to eval.. which isn't the most secure method=20
> for such a basic need.
>=20
> Regards
>=20
> Nathan
>=20
--=20
Mike <ipso@snappymail.ca>

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