ID: 44659
User updated by: spartacus4+php at gmail dot com
Reported By: spartacus4+php at gmail dot com
Status: Open
Bug Type: Math related
Operating System: Mac OSX
PHP Version: 5.2.5
New Comment:
Sorry, I through together that sample code really quick.
Here's a simplified sample code snippet that produces the same
results:
$amount = 49.83;
$out=array();
for($i=0; $i<1000; $i++){
if(!isset($out['test'])) $out['test']=0;
$out['test'] += $amount;
echo $out['test'].' + '.$amount.'<br>';
}
echo '<pre>';
print_r($out);
echo '</pre>';
// Messes up at value: 31243.41
Previous Comments:
------------------------------------------------------------------------
[2008-04-07 13:04:12] spartacus4+php at gmail dot com
Description:
------------
It appears PHP is adding incorrect decimal points.
The included test script shows this happening at value: 31243.41.
When I add the two values: 31243.41 + 49.83 it produces the correct
sum. But if I use it in an array that += the amount, it adds an
incorrect decimal value after several hundred add ons. It appears to be
a possible memory flaw when summing array values.
FYI: I'm actually using PHP version 5.2.3 - it was not an option in the
drop down.
Reproduce code:
---------------
$amount = '49.83';
$out=array();
$type='test';;
for($i=0; $i<1000; $i++){
if(!isset($out[$test][$result])) $out[$test][$result]=0;
$out[$test][$result] += $amount;
echo $out[$test][$result].' + '.$amount.'<br>';
}
echo '<pre>';
print_r($out);
echo '</pre>';
Expected result:
----------------
Either an explanation of why the decimal points are added only when
using an array value OR potentially a bug fix within new version fixing
this flaw.
Actual result:
--------------
Actual results are output within included code.
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Edit this bug report at http://bugs.php.net/?id=44659&edit=1
