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Tried to trigger this at home. But it works as expected.

But: 
  1. This is a linux machine.
  2. Home compiled
  3. I'm not stressed out...
  4. The code is much cleaner.

My guess is that I screwd up with one of the '&' in some deep nested retuen tree


As I said, this code works:
class ArrayObj implements ArrayAccess {

    private $_val;
    public  $valAsProp;

    function __construct($val){
        $this->_val = $val;
        $this->valAsProp =& $this->_val;
    }
    //
    // ArrayAccess interface
    //
    function  offsetExists($key)   { return isset($this->{'_'.$key});       }
    function &offsetGet($key)      { return       $this->{'get'.ucfirst($key)}();    }
    function  offsetSet($key,$val) {              $this->{'_'.$key} = $val; }
    function  offsetUnset($key)    {              $this->{'_'.$key} = null; }

    function &__get($key)          { return       $this->{'_'.$key};        }
    
    function &getVal() {
        return $this->_val;
    }
 }

$arrayobj = new ArrayObj(new ArrayObj('an other val'));

$db = new mysqli('localhost');
$stmt = $db->prepare("SELECT ? as `val`");
//$stmt->bind_param('s', $arrayobj->valAsProp);
//$stmt->bind_param('s', $arrayobj->val);
$stmt->bind_param('s', $arrayobj['val']['val']);
$stmt->execute();
$stmt->bind_result($res);
$stmt->fetch();
$stmt->close();

echo "\n$res\n";

?>

Not a bug in PHP then -> bogus.