How to Use code in external file/script in Magento 2

<?php
use Magento\Framework\App\Bootstrap;
 
require __DIR__ . '/app/bootstrap.php';
 
$params = $_SERVER;
 
$bootstrap = Bootstrap::create(BP, $params);
 
$obj = $bootstrap->getObjectManager();
 
$state = $obj->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');
 
$quoteId = 1;
$quote = $obj->get('Magento\Checkout\Model\Session')
             ->getQuote()
             ->load($quoteId);
 
echo '<pre>';
print_r($quote->getOrigData());
echo '</pre>';
 
$productId = 1;
$product = $obj->get('Magento\Catalog\Model\ProductRepository')
               ->getById($productId);
 
echo '<pre>';
print_r($product->getData());
echo '</pre>';
?>