In the context of PHP shopping cart functionality, what best practices should be followed to ensure session data is accurately maintained?

To ensure session data is accurately maintained in a PHP shopping cart, it is important to start the session at the beginning of each page where session data is needed, and to properly store and retrieve data using session variables. Additionally, it is recommended to regenerate the session ID periodically to prevent session fixation attacks.

// Start the session
session_start();

// Set session variables
$_SESSION['cart'] = array();

// Add item to cart
$_SESSION['cart'][] = array(
    'id' => 1,
    'name' => 'Product 1',
    'price' => 10.00
);

// Regenerate session ID
session_regenerate_id();