ThinkPHP 电商系统：商品管理+订单支付+购物车

// 商品模型
namespace app\model;

use think\Model;

class Product extends Model
{
    protected $table = 'products';

    public function addProduct($data)
    {
        return $this->save($data);
    }

    public function getProduct($id)
    {
        return $this->where('id', $id)->find();
    }

    public function updateProduct($id, $data)
    {
        return $this->where('id', $id)->update($data);
    }

    public function deleteProduct($id)
    {
        return $this->where('id', $id)->delete();
    }
}

// 订单控制器
namespace app\controller;

use think\Controller;
use app\model\Order;

class OrderController extends Controller
{
    public function createOrder($userId, $productId, $quantity)
    {
        $order = new Order();
        $order->user_id = $userId;
        $order->product_id = $productId;
        $order->quantity = $quantity;
        $order->status = 'pending';
        $order->save();

        return $order->id;
    }

    public function payOrder($orderId)
    {
        // 调用支付接口
        $paymentGateway = new PaymentGateway();
        $result = $paymentGateway->processPayment($orderId);

        if ($result) {
            $order = Order::find($orderId);
            $order->status = 'paid';
            $order->save();
            return true;
        }

        return false;
    }
}

// 购物车控制器
namespace app\controller;

use think\Controller;
use app\model\Product;

class CartController extends Controller
{
    public function addToCart($productId, $quantity)
    {
        $product = Product::getProduct($productId);
        if (!$product) {
            return false;
        }

        $cart = session('cart', []);
        if (isset($cart[$productId])) {
            $cart[$productId]['quantity'] += $quantity;
        } else {
            $cart[$productId] = [
                'product' => $product,
                'quantity' => $quantity
            ];
        }

        session('cart', $cart);
        return true;
    }

    public function removeFromCart($productId)
    {
        $cart = session('cart', []);
        if (isset($cart[$productId])) {
            unset($cart[$productId]);
            session('cart', $cart);
            return true;
        }

        return false;
    }

    public function getCart()
    {
        return session('cart', []);
    }
}

// 商品管理控制器
namespace app\admin\controller;

use think\Controller;
use app\model\Product;

class ProductController extends Controller
{
    public function index()
    {
        $products = Product::all();
        return view('admin/product/index', ['products' => $products]);
    }

    public function add()
    {
        if ($this->request->isPost()) {
            $data = $this->request->post();
            $product = new Product();
            if ($product->addProduct($data)) {
                return $this->success('商品添加成功');
            } else {
                return $this->error('商品添加失败');
            }
        }
        return view('admin/product/add');
    }

    public function edit($id)
    {
        $product = Product::getProduct($id);
        if ($this->request->isPost()) {
            $data = $this->request->post();
            if ($product->updateProduct($id, $data)) {
                return $this->success('商品更新成功');
            } else {
                return $this->error('商品更新失败');
            }
        }
        return view('admin/product/edit', ['product' => $product]);
    }

    public function delete($id)
    {
        $product = Product::getProduct($id);
        if ($product->deleteProduct($id)) {
            return $this->success('商品删除成功');
        } else {
            return $this->error('商品删除失败');
        }
    }
}

// 订单支付控制器
namespace app\controller;

use think\Controller;
use app\model\Order;

class OrderController extends Controller
{
    public function checkout()
    {
        $cart = session('cart', []);
        if (empty($cart)) {
            return $this->error('购物车为空');
        }

        $userId = session('user_id');
        $orderId = $this->createOrder($userId, $cart);

        return view('order/checkout', ['orderId' => $orderId]);
    }

    public function pay($orderId)
    {
        if ($this->payOrder($orderId)) {
            return $this->success('支付成功');
        } else {
            return $this->error('支付失败');
        }
    }
}

// 购物车控制器
namespace app\controller;

use think\Controller;

class CartController extends Controller
{
    public function index()
    {
        $cart = $this->getCart();
        return view('cart/index', ['cart' => $cart]);
    }

    public function add($productId, $quantity)
    {
        if ($this->addToCart($productId, $quantity)) {
            return $this->success('商品已添加到购物车');
        } else {
            return $this->error('商品添加失败');
        }
    }

    public function remove($productId)
    {
        if ($this->removeFromCart($productId)) {
            return $this->success('商品已从购物车移除');
        } else {
            return $this->error('商品移除失败');
        }
    }
}