Daniel and Derick, thanks for the replies..
Daniel first.. <?=3 * 5;?> is great :) however
$arithmetic_string = "3*5";
$arithmetic_value = arith($arithmetic_string);
not possible with the method you mentioned.
eval() yes this works, however personally I feel a simple arith() (or
more suitably named function) would be a great deal quicker and safer
than eval($_POST['sum']), the security dangers are somewhat obvious.
ps: I must point out that I've still never had a use for this and never
would (perhaps the fraction??), but somebody over on a dev forum does,
and I was quite suprised this functionality wasn't included! :P
Nathan
Daniel Brown wrote:
On Dec 7, 2007 9:51 AM, Nathan Rixham <[EMAIL PROTECTED]> wrote:
In-Built PHP Functions for parsing of basic arithmetic and if possible
fraction to decimal and decimal to fraction
PHP already handles half of what you're looking for by default.
$arithmetic_string = "3*5";
echo arith($arithmetic_string); // returns float 15
<?=3 * 5;?>
$arithmetic_string = "1/2";
echo arith($arithmetic_string); // returns float 0.5
<?=1 / 2;?>
$fraction_string = "1/4";
echo fracdec($fraction_string); // returns float 0.25
<?=1 / 4; ?>
$dec_string = "0.5";
echo decfrac($dec_string); // returns string "1/4"
Now I see why you need PHP to do your math for you! ;-P
There are functions written that do this now though.
I've used php for years, came accross the need for this today and was
suprised such a basic command wasn't there.. currently the only way I
can see to do it would be to eval.. which isn't the most secure method
for such a basic need.
Regards
Nathan
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