Zend Framework 1

Step 1 Create a login Action in controller

public function loginformAction(){
    	$this->view->assign("action","auth");
    	$this->view->assign('user',"Username");
    	$this->view->assign('pass',"Password");
    	$this->view->assign("submit","Login");
}

Step 2 Create an subsequent login.phtml file at view

public function authAction(){
    	$request=$this->getRequest();
    	$param= array("host"=>"localhost","username"=>"root",
                                 "password"=>"","dbname"=>"zend");
    	$db= new Zend_Db_Adapter_Pdo_Mysql($param);
    	$authadapter = new Zend_Auth_Adapter_DbTable($db);
        $authadapter->setTableName("employee")
                           ->setIdentityColumn("username")
                           ->setCredentialColumn("password");
    	$username=$request->getParam('user');
    	$password=$request->getParam('pass');
    	$authadapter->setIdentity($username);
    	$authadapter->setCredential($password);
    	$auth = Zend_Auth::getInstance();
    	$result =$auth->authenticate($authadapter);
    	if($result->isValid())
    	{
    		$this->_redirect("/index/list");
    	}else{
    		$this->_redirect("/index/loginform");
    	}
}
public function logoutAction(){
    // clear everything - session is cleared also!
    Zend_Auth::getInstance()->clearIdentity();
    $this->_redirect("/index/loginform");
}