rewrite-classes.php

<?php
ini_set('display_errors',true);
error_reporting(E_ALL | E_STRICT);

require 'app/Mage.php';

Mage::setIsDeveloperMode(true);

umask(0);

Mage::app();

header('Content-Type: text/plain');

echo get_class(
    Mage::getModel('customer/customer')
);
echo PHP_EOL;

echo get_class(
    Mage::getModel('sales/order_item')
);
echo PHP_EOL;

echo get_class(
    Mage::app()->getLayout()->createBlock('catalog/product_view')
);
echo PHP_EOL;

echo get_class(
    Mage::app()->getLayout()->createBlock('cms/block')
);
echo PHP_EOL;

echo get_class(
    Mage::helper('customer/address')
);
echo PHP_EOL;

echo get_class(
    Mage::helper('sales')
);
echo PHP_EOL;

echo get_class(
    Mage::getResourceModel('catalog/product')
);
echo PHP_EOL;