echo "Total Cost: " . calculate_total_cost();
echo "Total: $" . $total . "<br>";
PHP applications frequently use integer-based primary keys from SQL databases (MySQL, PostgreSQL) to retrieve records: php id 1 shopping
// Example usage if (isset($_POST['add_to_cart'])) $product_id = $_POST['product_id']; $quantity = $_POST['quantity']; add_to_cart($product_id, $quantity); echo "Total Cost: "
// Function to view cart function view_cart() global $conn; $query = "SELECT * FROM cart"; $result = $conn->query($query); while ($row = $result->fetch_assoc()) $product_id = $row['product_id']; $quantity = $row['quantity']; $query2 = "SELECT * FROM products WHERE id = '$product_id'"; $result2 = $conn->query($query2); $row2 = $result2->fetch_assoc(); echo "Product: " . $row2['name'] . ", Quantity: " . $quantity . ", Price: " . $row2['price'] . "<br>"; echo "Total Cost: " . calculate_total_cost()
Assume a vulnerable view_order.php script:
You can improve this code by adding more features, such as: