Zend FR

<?php
class Model_AuthAdapter implements Zend_Auth_Adapter_Interface
{
    protected $username;
    protected $password;
    protected $user;
    public function __construct($username, $password) {
        $this->username = $username;
        $this->password = $password;
        $this->user = new Model_DbTable_Users();
    }
    public function authenticate()
    {
        $match = $this->user->findCredentials($this->username, $this->password);
        //var_dump($match);
        if(!$match) {
            $result = new Zend_Auth_Result(Zend_Auth_Result::FAILURE_CREDENTIAL_INVALID, null);
        } else {
            $user = current($match);
            $result = new Zend_Auth_Result(Zend_Auth_Result::SUCCESS, $user);
        }
        return $result;
    }
}