How can PHP and MySQL be effectively used to manage user logins and shopping carts in an online shop?

To manage user logins and shopping carts in an online shop using PHP and MySQL, you can create a database table to store user information including usernames, passwords, and shopping cart items. When a user logs in, you can authenticate their credentials against the database. To manage shopping carts, you can store cart items in a separate table linked to the user's ID. 

// Database connection
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "shop";

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

// User login authentication
$username = $_POST['username'];
$password = $_POST['password'];

$sql = "SELECT * FROM users WHERE username='$username' AND password='$password'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // User authenticated, set session variables
    $_SESSION['username'] = $username;
}

// Add item to shopping cart
$item_id = $_POST['item_id'];
$user_id = $_SESSION['user_id'];

$sql = "INSERT INTO shopping_cart (user_id, item_id) VALUES ('$user_id', '$item_id')";
$conn->query($sql);

Keywords

PHP MySQL user logins shopping carts online shop

Related Questions