Add-cart.php Num
try // Begin Transaction for data integrity $pdo->beginTransaction(); // The Query // This attempts to insert the row. // If the user_id + product_id combo already exists, it updates the quantity instead. $sql = "INSERT INTO cart_items (user_id, product_id, quantity) VALUES (:user_id, :product_id, 1) ON DUPLICATE KEY UPDATE quantity = quantity + 1";
// Validate inputs if ($product_id <= 0) header('Location: products.php?error=invalid_product'); exit; add-cart.php num
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<!DOCTYPE html> <html> <head> <title>Shopping Cart</title> </head> <body> <h1>Shopping Cart</h1> // Validate inputs if ($product_id <