What are the basic requirements for setting up a shop system in PHP on a web server?

Setting up a shop system in PHP on a web server requires a few basic components: a database to store product information, a way to display products on the website, a shopping cart system to handle user interactions, and a payment gateway for processing transactions.

// Sample PHP code for setting up a shop system

// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "shop_system";

$conn = new mysqli($servername, $username, $password, $dbname);

// Display products on the website
$sql = "SELECT * FROM products";
$result = $conn->query($sql);

// Shopping cart system
session_start();

// Payment gateway for processing transactions
// Implement payment gateway integration code here