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Bug #43906 wrong calculation from function number_format
Submitted: 2008-01-22 11:21 UTC Modified: 2008-01-22 12:56 UTC
From: b dot paulsen at cms-mail dot de Assigned:
Status: Not a bug Package: *Math Functions
PHP Version: 4.4.8 OS: Linux
Private report: No CVE-ID: None
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From: b dot paulsen at cms-mail dot de
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 [2008-01-22 11:21 UTC] b dot paulsen at cms-mail dot de 
Description:
------------
Hello,

if you do follow code you get a wrong float back:

echo number_format(19.80,20,",",".");

19,80000000000000071054

thanks

Reproduce code:
---------------
echo number_format(19.80,20,",",".");

Expected result:
----------------
19,80000000000000071054

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 [2008-01-22 12:56 UTC] johannes@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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