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Bug #41583 number_format() return unexpected number for big number
Submitted: 2007-06-04 10:05 UTC Modified: 2007-06-04 12:34 UTC
From: info at qwerq dot com Assigned:
Status: Not a bug Package: Strings related
PHP Version: 4.4.7 OS: windows XP
Private report: No CVE-ID: None
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 [2007-06-04 10:05 UTC] info at qwerq dot com 
Description:
------------
My PHP version is 5.1.6 specifically, number_format() return unexpected result for big number

Reproduce code:
---------------
echo number_format(2000000000000000000000000, 0,'.',' ');


Expected result:
----------------
2 000 000 000 000 000 000 000 000

Actual result:
--------------
2 000 000 000 000 001 200 000 000

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 [2007-06-04 10:17 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.
 [2007-06-04 12:34 UTC] info at qwerq dot com 
Thanks your information and that link was very helpful, so I guess it's not PHP bug but it's my fault. :)
 
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