[zf] Zend_auth salting

[whisher]

Ciao.
Qc mi sa dire perchè non funziona

$authAdapter = new Zend_Auth_Adapter_DbTable(
    $db,
    'usersmy',
    'username',
    'password',
    "MD5(CONCAT('yoursalt' , ?, password_salt))" 
    ); 

SQL

CREATE TABLE IF NOT EXISTS `usersmy` (
  `id` int(11) NOT NULL auto_increment,
  `username` varchar(50) NOT NULL,
  `password` varchar(50) NOT NULL,
  `password_salt` varchar(50) NOT NULL,
  `real_name` varchar(100) NOT NULL,
  PRIMARY KEY  (`id`),
  UNIQUE KEY `username` (`username`)
) 
--
-- Dumping data for table `usersmy`
--

INSERT INTO `usersmy` (`id`, `username`, `password`, `password_salt`, `real_name`) VALUES
(1, 'rob', '760061f6bfde75c29af12f252d4d3345', 'yoursalt', 'rob rob'); 

Se volete qc info in + basta dirlo