From:             
Operating system: Linux version 2.6.35-22-generic-
PHP version:      5.3.3
Package:          Unknown/Other Function
Bug Type:         Bug
Bug description:'or' and '?:' operators has diferent behaviors

Description:
------------
The test script returns the following:



0 or 2 or 1 => 1

0 ?: 2 ?: 1 => 2

0 or 2 ?: 1 => 1

0 ?: 2 or 1 => 1



Is it desired?

Test script:
---------------
<?php



$a = 0;

$b = 2;

$c = 1;

echo $a.' or '.$b.' or '.$c.' => '; echo $a or $b or $c; echo "<br>\n";

echo $a.' ?: '.$b.' ?: '.$c.' => '; echo $a ?: $b ?: $c; echo "<br>\n";

echo $a.' or '.$b.' ?: '.$c.' => '; echo $a or $b ?: $c; echo "<br>\n";

echo $a.' ?: '.$b.' or '.$c.' => '; echo $a ?: $b or $c; echo "<br>\n";

Expected result:
----------------
0 or 2 or 1 => 2

0 ?: 2 ?: 1 => 2

0 or 2 ?: 1 => 2

0 ?: 2 or 1 => 2

Actual result:
--------------
0 or 2 or 1 => 1

0 ?: 2 ?: 1 => 2

0 or 2 ?: 1 => 1

0 ?: 2 or 1 => 1

-- 
Edit bug report at http://bugs.php.net/bug.php?id=53168&edit=1
-- 
Try a snapshot (PHP 5.2):            
http://bugs.php.net/fix.php?id=53168&r=trysnapshot52
Try a snapshot (PHP 5.3):            
http://bugs.php.net/fix.php?id=53168&r=trysnapshot53
Try a snapshot (trunk):              
http://bugs.php.net/fix.php?id=53168&r=trysnapshottrunk
Fixed in SVN:                        
http://bugs.php.net/fix.php?id=53168&r=fixed
Fixed in SVN and need be documented: 
http://bugs.php.net/fix.php?id=53168&r=needdocs
Fixed in release:                    
http://bugs.php.net/fix.php?id=53168&r=alreadyfixed
Need backtrace:                      
http://bugs.php.net/fix.php?id=53168&r=needtrace
Need Reproduce Script:               
http://bugs.php.net/fix.php?id=53168&r=needscript
Try newer version:                   
http://bugs.php.net/fix.php?id=53168&r=oldversion
Not developer issue:                 
http://bugs.php.net/fix.php?id=53168&r=support
Expected behavior:                   
http://bugs.php.net/fix.php?id=53168&r=notwrong
Not enough info:                     
http://bugs.php.net/fix.php?id=53168&r=notenoughinfo
Submitted twice:                     
http://bugs.php.net/fix.php?id=53168&r=submittedtwice
register_globals:                    
http://bugs.php.net/fix.php?id=53168&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=53168&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=53168&r=dst
IIS Stability:                       
http://bugs.php.net/fix.php?id=53168&r=isapi
Install GNU Sed:                     
http://bugs.php.net/fix.php?id=53168&r=gnused
Floating point limitations:          
http://bugs.php.net/fix.php?id=53168&r=float
No Zend Extensions:                  
http://bugs.php.net/fix.php?id=53168&r=nozend
MySQL Configuration Error:           
http://bugs.php.net/fix.php?id=53168&r=mysqlcfg

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