Description:
------------
Hi,

just discovered that an parameter wich passed to an function as an non reference of type object is handeld as an reference,
but if i pass a parameter of type array to the function it is handled
as a copie as it should be.

Reproduce code:
---------------
class foob {
  function testbar( $das )
  {
    unset( $das->ding );
  }
}

function testbar( $das )
{
  unset( $das->ding );
}

$ers = new stdClass();
$ers->ding = '323';
testbar($ers);
var_dump( $ers );

$ers2 = new stdClass();
$ers2->ding = '323';
$foob = new foob();
$foob->testbar($ers2);
var_dump( $ers2  );



Expected result:
----------------
Expected that properties still exists:
object(stdClass)#1 (1) { ["ding"]=>  string(3) "323" } object(stdClass)#2 (1) { ["ding"]=>  string(3) "323" }

Actual result:
--------------
Output:
object(stdClass)#1 (0) { } 
object(stdClass)#2 (0) { }