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Bug #46297 Round Issue
Submitted: 2008-10-15 05:19 UTC Modified: 2008-10-15 07:45 UTC
From: rob at washeretoo dot com Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.2.6 OS: Linux
Private report: No CVE-ID: None
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 [2008-10-15 05:19 UTC] rob at washeretoo dot com 
Description:
------------
round (1125.005, 2)
returns "1125.01" as expected

round(11125.005, 2)
returns "11125"

when the value before the decimal point gets to large it simply 
strips the decimal point value off!??

Reproduce code:
---------------
print round (1125.005, 2);
print round(11125.005, 2);

Expected result:
----------------
round(11125.005, 2) should return 11125.01

Actual result:
--------------
round(11125.005, 2) returns 11125

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 [2008-10-15 07:45 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.

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