Description:
------------
when you call PDOStatement::fetch() with the fetch mode PDO::FETCH_CLASS 
PDO will create FooClass' instance.
And in the creation process PDO (or script engine?) calls
__set() method before calling FooClass' __construct().

Reproduce code:
---------------
class FooClass
{
  public function __construct($param)
  {
    echo "FooClass::constructor\n";
  }

  protected function &__set($name, $value)
  {
    echo "FooClass::__set()\n";
  }
}

$pdo = new PDO($dsn, ...);
$stmt = $pdo->prepare('SELECT * FROM ...');
$stmt->setFetchMode(PDO::FETCH_CLASS, FooClass, array('bar'));
$fooInst = $stmt->fetch();


Expected result:
----------------
The script should output strings in the following order:
1. FooClass::constructor
2. FooClass::__set()

Actual result:
--------------
1. FooClass::__set()
2. FooClass::constructor