What are the key considerations for rebuilding a PHP script for a shopping cart system to address issues with data integrity and scalability?

Issue: To address issues with data integrity and scalability in a PHP script for a shopping cart system, it is important to implement proper database normalization, use prepared statements to prevent SQL injection attacks, and optimize queries for better performance. Code snippet: 

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

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

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Use prepared statements to prevent SQL injection
$stmt = $conn->prepare("SELECT * FROM products WHERE id = ?");
$stmt->bind_param("i", $product_id);
$product_id = 1;
$stmt->execute();
$result = $stmt->get_result();

// Fetch data and display in the shopping cart
while ($row = $result->fetch_assoc()) {
    echo "Product: " . $row["name"] . " | Price: $" . $row["price"] . "<br>";
}

$stmt->close();
$conn->close();

Keywords

PHP script shopping cart system data integrity scalability error handling

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