From: netnessie at gmail dot com
Operating system: Linux
PHP version: 5.2.0
PHP Bug Type: *Programming Data Structures
Bug description: Range function produces odd values in foreach loop
Description:
------------
When you use the range function, with a range between zero and 1,
incrementing by 0.05 each step, the loop produces an incorrect result when
you attempt to minus the current value in the loop from 1.
As you can see below, the last element in the array is the integer 1. The
script should echo the result of 1 minus 1. However, for some reason PHP
treats 1-1 as -2.22044604925E-16 instead of zero.
Reproduce code:
---------------
foreach (range(0,1,0.05) as $t)
{
echo (1-$t).'<br />';
}
Expected result:
----------------
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
Actual result:
--------------
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
-2.22044604925E-16
--
Edit bug report at http://bugs.php.net/?id=39464&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=39464&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=39464&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=39464&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=39464&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=39464&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=39464&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=39464&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=39464&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=39464&r=support
Expected behavior: http://bugs.php.net/fix.php?id=39464&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=39464&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=39464&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=39464&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=39464&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=39464&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=39464&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=39464&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=39464&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=39464&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=39464&r=mysqlcfg
