From: fizz at beyond dot hjsoft dot com
Operating system: linux, solaris
PHP version: 5.2.1
PHP Bug Type: Math related
Bug description: floating point rounding issue
Description:
------------
When printing out a floating point number using printf (or storing
it with sprintf, or casting it as an int) it gives an incorrect
number. This appears to be due to floating point math being
inaccurate.
Reproduce code:
---------------
<?php
$val = 309;
for ($x = 0; $x < 950; $x++)
$val += 0.001;
var_dump($val);
echo $val . "\n";
$val = $val * 100;
var_dump($val);
echo $val . "\n";
printf ("%d\n", $val);
echo (int)$val . "\n";
?>
Expected result:
----------------
float(309.95)
309.95
float(30995)
30995
30995
30995
Actual result:
--------------
float(309.95)
309.95
float(30995)
30995
30994
30994
--
Edit bug report at http://bugs.php.net/?id=40892&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=40892&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=40892&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=40892&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=40892&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=40892&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=40892&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=40892&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=40892&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=40892&r=support
Expected behavior: http://bugs.php.net/fix.php?id=40892&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=40892&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=40892&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=40892&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=40892&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=40892&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=40892&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=40892&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=40892&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=40892&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=40892&r=mysqlcfg
