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Bug #17787 integer/double problem
Submitted: 2002-06-16 11:49 UTC Modified: 2002-06-16 14:16 UTC
From: j dot neubert at 21torr dot com Assigned:
Status: Not a bug Package: Math related
PHP Version: 4.1.2 OS: Windows NT 5.0 build 2195
Private report: No CVE-ID: None
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From: j dot neubert at 21torr dot com
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 [2002-06-16 11:49 UTC] j dot neubert at 21torr dot com
$f = 2.26;
$g = $f*100;
//output = 225::226

$f = 2.26;
$g = $f*1000/10;
//output = 226::226

could anybody explain this to me

i also tested on Linux / php version 4.0.6
as far as i know 2.26 is the only double value
creating this bug...


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 [2002-06-16 14:16 UTC]
Sorry, but the bug system is not the appropriate forum for asking
support questions. Your problem does not imply a bug in PHP itself.
For a list of more appropriate places to ask for help using PHP,
please visit

Thank you for your interest in PHP.

See also:
 [2002-06-16 14:57 UTC] j dot neubert at 21torr dot com

the explanation on

seems to be pretty lame excuse for not being able or willing to check for a c-math-lib on the corrosponding system to be able to do such simple mathematic equations transparent to the user...

you have to admit that this could be very well regarded as a bug or a not very well documented feature... true, binary equations are a hastle to do, but with all of the things php does for you, this shouldn't be to much of a hastle for the php-developers... 

In the end it _IS_ an expected behaviour that 2.26 multiplied with 100 equals to 226, binary equation or not, statet in an obscure place in the documentation or not...

anyhow, have a nice day too and thanks for your quick reply.
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