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Bug #41808 number_format rounding error
Submitted: 2007-06-26 09:20 UTC Modified: 2007-06-26 11:18 UTC
From: bunb at gmx dot de Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 4.4.7 OS: windows
Private report: No CVE-ID: None
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 [2007-06-26 09:20 UTC] bunb at gmx dot de 
Description:
------------
Hello,

i have a big problem with number_format. My provider has two PHP-versions 4.4.7 and 5.2.3! On both versions there is the following bug:

number_format('1499.994', 2, ',', '.') results 1.499,99 = OK
number_format('1499.995', 2, ',', '.') results 1.499,99 = ERROR
number_format('1499.996', 2, ',', '.') results 1.500,00 = OK

strange is, that on my computer, wher PHP 5 ist lokal running, everything is OK

Can somebody help me?

Best regards

Boris

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 [2007-06-26 11:18 UTC] tony2001@php.net 
Floating point values have a limited precision. Hence a value might 
not have the same string representation after any processing. That also
includes writing a floating point value in your script and directly 
printing it without any mathematical operations.

If you would like to know more about "floats" and what IEEE
754 is read this:
http://docs.sun.com/source/806-3568/ncg_goldberg.html
 
Thank you for your interest in PHP.
 
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