Would sprintf() handle your needs?
This seems to work correctly...
$val = sprintf("%.0f",(10*(8.20-0.20)));
produces a string $val equal to 80.
Is this too geeky?
Jimtronic
>What a scary day, and it just gets worse....
>
>1. A user finds their account balance is displayed incorrectly on
>one of my live e-commerce sites.
>
>2. I discover that "floor()" intermittently gives the wrong answer i.e.
>
>print floor(10*(8.20 - 0.20));
>Answer : 79
>
>print floor(10*(8.10 - 0.10));
>Answer : 80
>
>(php 4.0.6 and 4.0.4.pl1 under Linux 2.2.19.)
>
>3. I find this is a known "feature" with no intention of ever being fixed. See
>http://bugs.php.net/bug.php?id=6220
>
>print floor( (0.7 + 0.1) * 10);
>Answer : 7
>
>
>4. I check the php documentation that was added because of that bug
>(http://www.php.net/manual/en/language.types.float.php) and discover :-
>
> "never trust floating number results to the last digit and never
>compare floating point numbers
>for equality."
>
>5. I realise that the "last digit" might also be the first so that
>means never trust anything except
>integers!
>
>6. The truth really sinks in... It seems I simply cannot use php for
>e-commerce applications unless
>I convert all money to integers e.g. $4.32 must be handled as 432
>cents, or all arithmetic
>operations and comparisons have to be converted to use bc functions.
>Instead of :
>
> if ($cost == 10.00)
>you must write
> if (bcomp($cost,10.00,2)) == 0)
>etc.,etc.
>
>7. The horror unfolds... php is just as full of geeko-trash as
>C/Perl/Java and the rest of them! I
>will have to spend the rest of my life worrying about
>types/casts/floating point precision and all
>that garbage even when I'm just adding up dollars and cents! I can't
>even escape to Italy and work
>in Lira, they're switching to euros with decimal places too! I
>should have stayed with Java, it may
>be rubbish but at least it's obviously rubbish!
>
>
>Please someone, tell me I'm wrong!
>
>Tell me that 0.1 + 0.7 can be 0.8 and not almost 0.8!
>Tell me I don't have to check the last three years of work!
>Tell me php isn't just for kids waiting to graduate/degradate to Java!
>Tell me the techno-geeks haven't won!
>
>Hellllllpppppppp......
>
>
>George
>
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--
Jim Musil
---------
Multimedia Programmer
Nettmedia
-------------
212-629-0004
[EMAIL PROTECTED]
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