From:
Operating system: n/a
PHP version: 5.3.6
Package: *Math Functions
Bug Type: Bug
Bug description:round doesn't work with non-14 precision
Description:
------------
Round() doesn't work right when the precision is set to e.g. 16.
The last comment in #51701 also makes notice of this. (However it seems
unrelated to that bugreport.)
Bug #5500 states that you shouldn't set the precision higher than the
data-type can hold. If that's still true I think we should add a warning
when setting the precision too high instead of just accepting it and trying
to work it out.
_php_math_round in ext/standard/math.c cites:
if ((precision_places = php_intlog10abs(value)) > 0) {
precision_places = 14 - php_intlog10abs(value);
} else {
precision_places = 14;
}
and I guess 14 shouldn't be hardcoded there.
Test script:
---------------
php > ini_set('precision', 30);
php > var_dump(round((5.5/100), 3));
Expected result:
----------------
float(0.055)
Actual result:
--------------
float(0.0550000000000000002775557561563)
--
Edit bug report at http://bugs.php.net/bug.php?id=54985&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=54985&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=54985&r=trysnapshot53
Try a snapshot (trunk):
http://bugs.php.net/fix.php?id=54985&r=trysnapshottrunk
Fixed in SVN:
http://bugs.php.net/fix.php?id=54985&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=54985&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=54985&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=54985&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=54985&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=54985&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=54985&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=54985&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=54985&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=54985&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=54985&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=54985&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=54985&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=54985&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=54985&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=54985&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=54985&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=54985&r=mysqlcfg
