From:             wdolek at gmail dot com
Operating system: GNU/Linux
PHP version:      5.2.11
PHP Bug Type:     Feature/Change Request
Bug description:  undefined constant is consider to be string

Description:
------------
when using undefined constant, PHP consider name of constant to be string.
when using this constant in if () or anywhere else, string value is cast as
TRUE, which could confuse developer

Reproduce code:
---------------
// define('MY_DEFINED_CONSTANT', FALSE);

if (MY_DEFINED_CONSTANT) {
 echo 'value of constant is TRUE';
} else {
 echo 'value of constant is FALSE';
}

Expected result:
----------------
* error or at least warning, that we are using undefined constant *

Actual result:
--------------
value of constant is TRUE

-- 
Edit bug report at http://bugs.php.net/?id=50331&edit=1
-- 
Try a snapshot (PHP 5.2):            
http://bugs.php.net/fix.php?id=50331&r=trysnapshot52
Try a snapshot (PHP 5.3):            
http://bugs.php.net/fix.php?id=50331&r=trysnapshot53
Try a snapshot (PHP 6.0):            
http://bugs.php.net/fix.php?id=50331&r=trysnapshot60
Fixed in SVN:                        
http://bugs.php.net/fix.php?id=50331&r=fixed
Fixed in SVN and need be documented: 
http://bugs.php.net/fix.php?id=50331&r=needdocs
Fixed in release:                    
http://bugs.php.net/fix.php?id=50331&r=alreadyfixed
Need backtrace:                      
http://bugs.php.net/fix.php?id=50331&r=needtrace
Need Reproduce Script:               
http://bugs.php.net/fix.php?id=50331&r=needscript
Try newer version:                   
http://bugs.php.net/fix.php?id=50331&r=oldversion
Not developer issue:                 
http://bugs.php.net/fix.php?id=50331&r=support
Expected behavior:                   
http://bugs.php.net/fix.php?id=50331&r=notwrong
Not enough info:                     
http://bugs.php.net/fix.php?id=50331&r=notenoughinfo
Submitted twice:                     
http://bugs.php.net/fix.php?id=50331&r=submittedtwice
register_globals:                    
http://bugs.php.net/fix.php?id=50331&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=50331&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=50331&r=dst
IIS Stability:                       
http://bugs.php.net/fix.php?id=50331&r=isapi
Install GNU Sed:                     
http://bugs.php.net/fix.php?id=50331&r=gnused
Floating point limitations:          
http://bugs.php.net/fix.php?id=50331&r=float
No Zend Extensions:                  
http://bugs.php.net/fix.php?id=50331&r=nozend
MySQL Configuration Error:           
http://bugs.php.net/fix.php?id=50331&r=mysqlcfg

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