php - Magento login a customer programmatically -

i trying login customer programmatically in magento. have followed this tutorial.

so created file named test.php in root of magento app.

<?php    require_once 'app/mage.php';   function loginbyid($customerid) {     mage::app(); // make sure mage::getmodel() works    $customer = mage::getmodel('customer/customer')->load($customerid);     if ($customer->getwebsiteid()) {         mage::init($customer->getwebsiteid(), 'website');         $session = mage::getsingleton('customer/session');         $session->loginbyid($customerid);         return $session;     }     throw new exception('login failed'); }      try {     $session = loginbyid(1);     //echo mage_customer_model_session::isloggedin();exit;    // var_dump($session);exit;             // function login() above     $session->setafterauthurl(             'http://192.168.1.61/magento/index.php/customer/account');     //echo $session->getafterauthurl();exit;     header('location: ' . $session->getafterauthurl());  } catch (mage_core_exception $e) {     echo "error"; } 

but when access file, redirect me login form.

try one

<?php function loginuser( $email, $password )     require_once ("app/mage.php");     umask(0);     ob_start();     session_start();     mage::app('default');     mage::getsingleton("core/session", array("name" => "frontend"));      $websiteid = mage::app()->getwebsite()->getid();     $store = mage::app()->getstore();     $customer = mage::getmodel("customer/customer");     $customer->website_id = $websiteid;     $customer->setstore($store);     try {         $customer->loadbyemail($email);         $session = mage::getsingleton('customer/session')->setcustomerasloggedin($customer);         $session->login($email, $password);     }catch(exception $e){      }     }  ?>