From:             carmen at helderhosting dot nl
Operating system: unix
PHP version:      5.3.0
PHP Bug Type:     SPL related
Bug description:  offsetExists wrong result

Description:
------------
If $o = new ArrayObject(); $o['x'] = null;
the result for isset($o['x']) it should be false, instead true is given

Reproduce code:
---------------
<?php
$a = array();
$a['x'] = null;
var_dump(isset($a['x']));
var_dump(empty($a['x']));
var_dump(array_key_exists('x', $a));

$o = new ArrayObject();
$o['x'] = null;
var_dump($o->offsetExists('x'));
var_dump(isset($o['x']));
var_dump(empty($o['x']));
var_dump(array_key_exists('x', $o));
?>

Expected result:
----------------
bool(false)
bool(true)
bool(true)
bool(true)
bool(false)
bool(true)
bool(true)

Actual result:
--------------
bool(false)
bool(true)
bool(true)
bool(true)
bool(true)
bool(true)
bool(true)

-- 
Edit bug report at http://bugs.php.net/?id=49889&edit=1
-- 
Try a snapshot (PHP 5.2):            
http://bugs.php.net/fix.php?id=49889&r=trysnapshot52
Try a snapshot (PHP 5.3):            
http://bugs.php.net/fix.php?id=49889&r=trysnapshot53
Try a snapshot (PHP 6.0):            
http://bugs.php.net/fix.php?id=49889&r=trysnapshot60
Fixed in SVN:                        
http://bugs.php.net/fix.php?id=49889&r=fixed
Fixed in SVN and need be documented: 
http://bugs.php.net/fix.php?id=49889&r=needdocs
Fixed in release:                    
http://bugs.php.net/fix.php?id=49889&r=alreadyfixed
Need backtrace:                      
http://bugs.php.net/fix.php?id=49889&r=needtrace
Need Reproduce Script:               
http://bugs.php.net/fix.php?id=49889&r=needscript
Try newer version:                   
http://bugs.php.net/fix.php?id=49889&r=oldversion
Not developer issue:                 
http://bugs.php.net/fix.php?id=49889&r=support
Expected behavior:                   
http://bugs.php.net/fix.php?id=49889&r=notwrong
Not enough info:                     
http://bugs.php.net/fix.php?id=49889&r=notenoughinfo
Submitted twice:                     
http://bugs.php.net/fix.php?id=49889&r=submittedtwice
register_globals:                    
http://bugs.php.net/fix.php?id=49889&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=49889&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=49889&r=dst
IIS Stability:                       
http://bugs.php.net/fix.php?id=49889&r=isapi
Install GNU Sed:                     
http://bugs.php.net/fix.php?id=49889&r=gnused
Floating point limitations:          
http://bugs.php.net/fix.php?id=49889&r=float
No Zend Extensions:                  
http://bugs.php.net/fix.php?id=49889&r=nozend
MySQL Configuration Error:           
http://bugs.php.net/fix.php?id=49889&r=mysqlcfg

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