How to Use Magento 2 code in external File/Script

This script allows you to call Magento 2 functions run outside Magento 2 setup. You can create any PHP file in Magento 2 root folder and run Magento 2 from there.

This below script loads a product repository and calls details of product id = 1.

<?php
use Magento\Framework\App\Bootstrap;

require __DIR__ . '/app/bootstrap.php';

$params = $_SERVER;

$bootstrap = Bootstrap::create(BP, $params);

//Call Object manager
$obj = $bootstrap->getObjectManager();

$state = $obj->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');

$productId = 1;
$product = $obj->get('Magento\Catalog\Model\ProductRepository')
    ->getById($productId);

print "Product Name : \n";
print $product->getData('name');
print "\nProduct Price : \n";
print $product->getData('price');
?>