Zend Framework and CodeIgniter Model class doubts

Both zend and CI framework have seperate Model, View, Controller directories. My doubt is how to use model in Zend Framework.

[ CodeIgniter Controller ]

<?php
class Users extends CI_Controller
{
    function __construct()
    {
        parent::__construct();
        $this->load->model('users_model');
    }

    function index()
    {
        // here i am using model function //
        $myvar = $this->user_model->login();
    }
}
?>

[ Zend Framework Controller ]

<?php
class UsersController extends Zend_Controller_Action
{
    public function indexAction()
    {
        // how to load model and use here ???? //
    }
}
?>

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In CodeIgniter Controller I load model "users_model" and used in index function. In the same way how to create zend model and use in controller? please help me, sorry my english is not good.

Thanks friends, Rajendra

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You shouldn't compare Zend with CodeIgniter since the philosophy is quite different.

It is best to read: http://framework.zend.com/manual/en/learning.quickstart.create-model.html