From:             dan at yes dot lt
Operating system: WinXP
PHP version:      5.2.3
PHP Bug Type:     SPL related
Bug description:  ArrayAccess::offsetExists works wrong with isset()

Description:
------------
method ArrayAccess actualy works wrong with isset()/empty()...

isset()/empty() now calls only ArrayAccess::offsetExist, but should call
both ArrayAccess::offsetExist and ArrayAccess::offsetGet to check if value
is realy set.

that's how arrays do...

Reproduce code:
---------------
class Test implements ArrayAccess
{
  protected $_array = array();
  protected $_count = 0;

  function offsetExists($offset)
  {
    return $offset >= 0 && $offset < $this->_count;
  }
  function offsetGet($offset)
  {
    return $this->_array[$offset];
  }
  function offsetSet($offset, $value)
  {
    $this->_array[] = $value;
    $this->_count++;
  }
  function offsetUnset($offset)
  {
    unset($this->_array[$offset]);
  }
}

$a = new Test;
$a[] = 'A';  // 0
$a[] = 10;   // 1
$a[] = null; // 2

echo isset($a[0]) ? 'set' : 'unset', "\n";
echo isset($a[1]) ? 'set' : 'unset', "\n";
echo isset($a[2]) ? 'set' : 'unset', "\n";

Expected result:
----------------
set
set
unset

Actual result:
--------------
set
set
set

-- 
Edit bug report at http://bugs.php.net/?id=41727&edit=1
-- 
Try a CVS snapshot (PHP 4.4): 
http://bugs.php.net/fix.php?id=41727&r=trysnapshot44
Try a CVS snapshot (PHP 5.2): 
http://bugs.php.net/fix.php?id=41727&r=trysnapshot52
Try a CVS snapshot (PHP 6.0): 
http://bugs.php.net/fix.php?id=41727&r=trysnapshot60
Fixed in CVS:                 http://bugs.php.net/fix.php?id=41727&r=fixedcvs
Fixed in release:             
http://bugs.php.net/fix.php?id=41727&r=alreadyfixed
Need backtrace:               http://bugs.php.net/fix.php?id=41727&r=needtrace
Need Reproduce Script:        http://bugs.php.net/fix.php?id=41727&r=needscript
Try newer version:            http://bugs.php.net/fix.php?id=41727&r=oldversion
Not developer issue:          http://bugs.php.net/fix.php?id=41727&r=support
Expected behavior:            http://bugs.php.net/fix.php?id=41727&r=notwrong
Not enough info:              
http://bugs.php.net/fix.php?id=41727&r=notenoughinfo
Submitted twice:              
http://bugs.php.net/fix.php?id=41727&r=submittedtwice
register_globals:             http://bugs.php.net/fix.php?id=41727&r=globals
PHP 3 support discontinued:   http://bugs.php.net/fix.php?id=41727&r=php3
Daylight Savings:             http://bugs.php.net/fix.php?id=41727&r=dst
IIS Stability:                http://bugs.php.net/fix.php?id=41727&r=isapi
Install GNU Sed:              http://bugs.php.net/fix.php?id=41727&r=gnused
Floating point limitations:   http://bugs.php.net/fix.php?id=41727&r=float
No Zend Extensions:           http://bugs.php.net/fix.php?id=41727&r=nozend
MySQL Configuration Error:    http://bugs.php.net/fix.php?id=41727&r=mysqlcfg

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