1. Go to this page and download the library: Download shopify/shopify-php library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
shopify / shopify-php example snippets
Shopify\ShopifyClient;
$client = new ShopifyClient($access_token, "yourshop.myshopify.com");
$products = $client->products->readList();