From: php at michaelho dot com
Operating system: Mac OS X 10.4.9
PHP version: 5.2.1
PHP Bug Type: Variables related
Bug description: settype 'float' yields incosistent results
Description:
------------
Using settype() to alter FLOATs yields inconsistent values that will
sometimes fail comparison operators.
Reproduce code:
---------------
<?php
// THIS WILL WORK
$fltOriginal = 3 * .5;
$fltTransformed = $fltOriginal;
settype($fltTransformed, 'string');
settype($fltTransformed, 'float');
var_dump($fltOriginal);
var_dump($fltTransformed);
if ($fltOriginal != $fltTransformed) print ('COMPARISON FAILED -- BUG');
print ("--------------------------\r\n");
// THIS WILL **NOT** WORK
$fltOriginal = 3 * .6;
$fltTransformed = $fltOriginal;
settype($fltTransformed, 'string');
settype($fltTransformed, 'float');
var_dump($fltOriginal);
var_dump($fltTransformed);
if ($fltOriginal != $fltTransformed) print ('COMPARISON FAILED -- BUG');
?>
Expected result:
----------------
float(1.5)
float(1.5)
--------------------------
float(1.8)
float(1.8)
Actual result:
--------------
float(1.5)
float(1.5)
--------------------------
float(1.8)
float(1.8)
COMPARISON FAILED -- BUG
--
Edit bug report at http://bugs.php.net/?id=41154&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=41154&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=41154&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=41154&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=41154&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=41154&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=41154&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=41154&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=41154&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=41154&r=support
Expected behavior: http://bugs.php.net/fix.php?id=41154&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=41154&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=41154&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=41154&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=41154&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=41154&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=41154&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=41154&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=41154&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=41154&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=41154&r=mysqlcfg
