From:
Operating system: Ubuntu
PHP version: 5.3SVN-2011-08-27 (SVN)
Package: Math related
Bug Type: Bug
Bug description:for loop incorrect arithmetic iteration
Description:
------------
<?php
for ($i=0; $i<100; $i=$i+0.1) {
echo $i.'|';
}
?>
this produces something like:
0|0.1|0.2|0.3|0.4|0.5|0.6|0.7|0.8|0.9...
...53.6|53.7|53.8|53.9|54|54.1|54.200000000001|54.300000000001|54.400000000001|54.500000000001|...
...66.200000000001|66.300000000001|66.400000000001|66.5|66.6|66.7|66.8|66.9|67|67.1|67.2|...
...83.7|83.8|83.9|84|84.099999999999|84.199999999999|84.299999999999...
...99.799999999999|99.899999999999|99.999999999999|
I believe it makes one more iteration then it should.
Test script:
---------------
<?php
for ($i=0; $i<100; $i=$i+0.1) {
echo $i.'|';
}
?>
Expected result:
----------------
0|0.1|0.2|0.3|...53.9|54|54.1|54.2|54.3|54.4|...99.9|
--
Edit bug report at https://bugs.php.net/bug.php?id=55518&edit=1
--
Try a snapshot (PHP 5.4):
https://bugs.php.net/fix.php?id=55518&r=trysnapshot54
Try a snapshot (PHP 5.3):
https://bugs.php.net/fix.php?id=55518&r=trysnapshot53
Try a snapshot (trunk):
https://bugs.php.net/fix.php?id=55518&r=trysnapshottrunk
Fixed in SVN:
https://bugs.php.net/fix.php?id=55518&r=fixed
Fixed in SVN and need be documented:
https://bugs.php.net/fix.php?id=55518&r=needdocs
Fixed in release:
https://bugs.php.net/fix.php?id=55518&r=alreadyfixed
Need backtrace:
https://bugs.php.net/fix.php?id=55518&r=needtrace
Need Reproduce Script:
https://bugs.php.net/fix.php?id=55518&r=needscript
Try newer version:
https://bugs.php.net/fix.php?id=55518&r=oldversion
Not developer issue:
https://bugs.php.net/fix.php?id=55518&r=support
Expected behavior:
https://bugs.php.net/fix.php?id=55518&r=notwrong
Not enough info:
https://bugs.php.net/fix.php?id=55518&r=notenoughinfo
Submitted twice:
https://bugs.php.net/fix.php?id=55518&r=submittedtwice
register_globals:
https://bugs.php.net/fix.php?id=55518&r=globals
PHP 4 support discontinued:
https://bugs.php.net/fix.php?id=55518&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=55518&r=dst
IIS Stability:
https://bugs.php.net/fix.php?id=55518&r=isapi
Install GNU Sed:
https://bugs.php.net/fix.php?id=55518&r=gnused
Floating point limitations:
https://bugs.php.net/fix.php?id=55518&r=float
No Zend Extensions:
https://bugs.php.net/fix.php?id=55518&r=nozend
MySQL Configuration Error:
https://bugs.php.net/fix.php?id=55518&r=mysqlcfg
