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Bug #45300 Bug in number format
Submitted: 2008-06-18 12:50 UTC Modified: 2008-07-01 09:54 UTC
Votes:2
Avg. Score:4.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: gernovich at ya dot ru Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 5.2.6 OS: win xp
Private report: No CVE-ID: None
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 [2008-06-18 12:50 UTC] gernovich at ya dot ru 
Description:
------------
Convertion problem with float types.
The problem is also affected on round() and ceil(),
but number_format() not no mathematical function.

Reproduce code:
---------------
$a = -0.014;
print round($a,1)."\n"; // -0 bogus
print number_format($a, 1)."\n"; // -0.0 bug

Expected result:
----------------
-0
0.0


Actual result:
--------------
-0
-0.0

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 [2008-07-01 09:54 UTC] jani@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
 
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