ex 4

<?php

//the view

?>

<br /><br />
<div id="view-content">
    <p>Login to the app!</p>

    <?php echo $this->loginForm; ?>

    <a href="/users/logout" title="logout">Logout</a>

    <br />
    <?php
    if ($this->auth){
        echo 'logged in correctly!';
    }else{
        echo 'not logged in!';
    }
    ?>

</div>

<?php

//the login class
class Application_Form_Login extends Zend_Form
{

    function init(){

        $this->setAction('/users/login')
             ->setMethod('post');

        // Create and configure username element:
        $username = $this->createElement('text', 'name');
        $username->addValidator('alnum')
                 ->addValidator('regex', false, array('/^[a-z]+/'))
                 ->addValidator('stringLength', false, array(6, 20))
                 ->setRequired(true)
                 ->addFilter('StringToLower');

        // Create and configure password element:
        $password = $this->createElement('password', 'password');
        $password->addValidator('StringLength', false, array(6))
                 ->setRequired(true);

        // Add elements to form:
        $this->addElement($username)
             ->addElement($password)
             ->addElement('submit', 'login', array('label' => 'Login'));

    }

}

//the controller action

 public function loginAction()
    {

        $loginForm = new Application_Form_Login();

        $this->view->loginForm = $loginForm;

        if ( ($this->getRequest()->isPost('name') != '') && $loginForm->isValid($_POST)  )
        {

            $username = $loginForm->getValue('name');
            $password = $loginForm->getValue('password');

            $authObject = new Application_Model_Authenticate();
            $loginStatus = $authObject->checkCreds($username, $password);

            $this->view->auth = $loginStatus;
            $this->view->nameValue = $username;


        }



    }

//the authentication class

 class Application_Model_Authenticate
{

    function __construct(){

    }


    public function checkCreds($username, $password)
    {
        $db = Zend_Db_Table::getDefaultAdapter();
        $authAdapter = new Zend_Auth_Adapter_DbTable($db);

        $authAdapter
            ->setTableName('users')
            ->setIdentityColumn('username')
            ->setCredentialColumn('password')
            ->setIdentity($username)
            ->setCredential($password)
            ->setCredentialTreatment('MD5(?)');

        $result = $authAdapter->authenticate();

        return $result->isValid();

    }