Magento runtime for Customer

rt_customer

<?php
// Prevent this script to be called via HTTP
if (isset($_SERVER['REQUEST_METHOD']))
{
    die('Permission denied.');
}

// Avoid any time limit
set_time_limit(0);

// Avoid any memory limit
ini_set('memory_limit', -1);

// Include bootstrap code and Mage class
require_once 'app/Mage.php';

// Enable developer mode
Mage::setIsDeveloperMode(true);

// Set the default file creation mask
umask(0);

// Init application with default store
Mage::app();

// Load frontend config area
Mage::app()->loadArea(Mage_Core_Model_App_Area::AREA_FRONTEND);

// Initialize customer session
$userModel = Mage::getModel('customer/customer');
$customer = $userModel->load(1); // change customer id here
$customerSession = Mage::getSingleton('customer/session');
$customerSession->setCustomerAsLoggedIn($customer);
$customerSession->renewSession();