Description:
------------
I use PDO::FETCH_CLASS mode for fetching DB data with PDO. But when I implement __set method in my data class, Apache crashes.

Reproduce code:
---------------
<?
class EEE {
	function __set ($field, $value) {
		echo 'hello world';
	}
}

$a = new PDO("sqlite::memory:");// pool ("sqlite::memory:");
$a->query ("CREATE TABLE test (a integer primary key, b text)");
$b = $a->prepare("insert into test (b) values (?)");
$b->execute(array (5));
$rez = $a->query ("SELECT * FROM test")->fetchAll(PDO::FETCH_CLASS, 'EEE');


Expected result:
----------------
$rez contains 1 object of class EEE

Actual result:
--------------
Apache crashes.