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Bug #42087 PHP 4.3.0/Linux-- Round() Function Problem.
Submitted: 2007-07-24 14:18 UTC Modified: 2007-07-24 14:53 UTC
From: kalhan dot d at gmail dot com Assigned:
Status: Not a bug Package: *Math Functions
PHP Version: 4.4.7 OS: Linux
Private report: No CVE-ID: None
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 [2007-07-24 14:18 UTC] kalhan dot d at gmail dot com
Description:
------------
echo  round( .6245, 3 ) // Output 0.625

In the 1st example If the 2nd last value is < 5 and last value is 5 then it adding one in the last value after rounding.

Opetating Systems:
   1. Linux
   2. Windows 2000 Professional.
Web Server:
   1. Apache 2.0
PHP version:
   1. PHP 4.3.0 on Linux
   2. PHP 5.2.0 on Windows

Expected result:
----------------
0.624

Actual result:
--------------
0.625

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 [2007-07-24 14:53 UTC] derick@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.

(and you probably swapped expected and actual results)
 
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