#49426 [NEW]: logicerror in boolean cast from string

From: Date: Mon, 31 Aug 2009 17:49:29 +0000
Subject: #49426 [NEW]: logicerror in boolean cast from string
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-141767@lists.php.net to get a copy of this message 
From:             az at kreatiefer dot de
Operating system: Ubuntu 9.04
PHP version:      5.3.0
PHP Bug Type:     *General Issues
Bug description:  logicerror in boolean cast from string

Description:
------------
When you cast a string variable to boolean type there are some cases in
which the cast doesn't work properly, i think.

Reproduce code:
---------------
$arrTestVars = array(
  '0',
  '-0',
  '+0',
  '0.0',
  '0e0',
  '0.0e0'
);

foreach($arrTestVars as $strTestVar) {
  var_dump(
    (bool)$strTestVar
  );
}


Expected result:
----------------
// Expected Result => (bool)false, (bool)false, (bool)false, (bool)false,
(bool)false, (bool)false

All the tests above should be evaluated to false, because
(bool)0.0 === false
(bool)0e0 === false
and so on.

Now one has to use the workaround (bool)(int)'0.0' === false ...


Actual result:
--------------
// Actual Result => (bool)false, (bool)true, (bool)true, (bool)true,
(bool)true, (bool)true

-- 
Edit bug report at http://bugs.php.net/?id=49426&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=49426&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=49426&r=trysnapshot53
Try a snapshot (PHP 6.0):            http://bugs.php.net/fix.php?id=49426&r=trysnapshot60
Fixed in SVN:                        http://bugs.php.net/fix.php?id=49426&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=49426&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=49426&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=49426&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=49426&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=49426&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=49426&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=49426&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=49426&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=49426&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=49426&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=49426&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=49426&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=49426&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=49426&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=49426&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=49426&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=49426&r=mysqlcfg

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