From: guaycuru at gmail dot com
Operating system: Any
PHP version: 5.4.12
Package: Scripting Engine problem
Bug Type: Feature/Change Request
Bug description:Float inconsistency between echo/var_dump and tests
Description:
------------
So, I know that due to the way computers store float numbers, we end up
with some
oddities. This BUG is NOT about that. Instead, I found some inconsistencies
on how
PHP handle that, and it's easy to think of cases that those inconsistencies
would
end up causing lots of wasted hours debugging.
Please see test script, it should be pretty self explanatory.
My change request is that, since float / echo deal with that inconsistency
(rounding 0.3000000000000000444089209850062616169452667236328125 to 0.3),
so
should control flow functions like IF, WHILE, etc...
Tested on PHP 5.3.22 and PHP 5.4.12
Test script:
---------------
<?php
$a = 0.1;
$b = 0.2;
var_dump($a + $b);
if($a + $b <= 0.3)
echo "All is right in the universe!";
else
echo "Something is wrong here!";
?>
Expected result:
----------------
float(0.3)
All is right in the universe!
Also, this result is acceptable:
float(0.3000000000000000444089209850062616169452667236328125)
Something is wrong here!
Actual result:
--------------
float(0.3)
Something is wrong here!
--
Edit bug report at https://bugs.php.net/bug.php?id=64323&edit=1
--
Try a snapshot (PHP 5.4):
https://bugs.php.net/fix.php?id=64323&r=trysnapshot54
Try a snapshot (PHP 5.3):
https://bugs.php.net/fix.php?id=64323&r=trysnapshot53
Try a snapshot (trunk):
https://bugs.php.net/fix.php?id=64323&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=64323&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=64323&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=64323&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=64323&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=64323&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=64323&r=support
Expected behavior: https://bugs.php.net/fix.php?id=64323&r=notwrong
Not enough info:
https://bugs.php.net/fix.php?id=64323&r=notenoughinfo
Submitted twice:
https://bugs.php.net/fix.php?id=64323&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=64323&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=64323&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=64323&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=64323&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=64323&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=64323&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=64323&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=64323&r=mysqlcfg
