??, ?? ? ?? ??? ??? ??????? ???? ???. ?? SQL ??? phpMyAdmin ?? ?? MySQL ?????? ???? ???? ??????? ????.

CREATE DATABASE cart DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci; ?? ?? ?? ? ?? ??? ??? ? ?? ???? ???? ???. ?? SQL ?? "products"? "orders"?? ? ?? ???? ?????. CREATE TABLE ??( product_id INT ?? ?, ??_?? VARCHAR(50), ?? ???(10,2) ); CREATE TABLE ??( order_id INT ?? ?, ??_ID INT, ??_?? DATE, ?? INT, FOREIGN KEY (product_id) REFERENCES ??(product_id) );

CREATE TABLE products (
 id int(11) NOT NULL AUTO_INCREMENT,
 name varchar(255) NOT NULL,
 description text NOT NULL,
 price float NOT NULL,
 PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE orders (
 id int(11) NOT NULL AUTO_INCREMENT,
 user_id int(11) NOT NULL,
 product_id int(11) NOT NULL,
 quantity int(11) NOT NULL,
 created_at timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
 PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

?? ??????? ???? ???. Composer? ???? ThinkPHP ?????? ?????:

composer create-project topthink/think tp5 --prefer-dist

?? ??, ?? ??? ???? tp5/application/common.php ??? ??????. ??? ???? ??? ???? ?? ?? ??? ?? "getCart"? ?????.

<?php
use app\index\model\Cart;
function getCart()
{
$user_id = 1; // 此處默認(rèn)用戶ID為1，實際應(yīng)用中應(yīng)該從會話中獲取用戶ID
$cart = Cart::where(&#39;user_id&#39;, $user_id)->select();
return $cart;
}

???? ??? ????? ?? ??? ???? ?? "Cart"?? ??? ???? ???.

<?php
namespace app\index\model;
use think\Model;
class Cart extends Model
{
protected $table = &#39;orders&#39;;

static function add($product_id, $quantity)
{
    $user_id = 1; // 此處默認(rèn)用戶ID為1，實際應(yīng)用中應(yīng)該從會話中獲取用戶ID
    $order = new Cart();
    $order->user_id = $user_id;
    $order->product_id = $product_id;
    $order->quantity = $quantity;
    $order->save();
}

static function remove($id)
{
    Cart::destroy($id);
}
}

?? "????" ??? ???? ??????? ????? ??? ????? ??? ? ????. ????? ??? ????? ?? ??? ?????.

Cart::add($product_id, $quantity);

?????? ??? ???? ??? ??? ????.

Cart::remove($id);

????? ????? ???? ???. "Cart" ????? ???? ? ?? ???? ?????. ??? ?? ??? ???? ??? ?? ??? ??? ??? ???? ????.

<?php
namespace app\index\controller;
use app\index\model\Cart;
class CartController extends BaseController
{
public function index()
{
    $cart = getCart();
    $this->assign(&#39;cart&#39;, $cart);
    return $this->fetch();
}

public function add()
{
    $product_id = input(&#39;post.product_id&#39;);
    $quantity = input(&#39;post.quantity&#39;);

    Cart::add($product_id, $quantity);

    $this->success(&#39;添加成功&#39;, url(&#39;index&#39;));
}
}

? ??? ??? ? ??? ???? ??????? ????? ??????. ?? CartController? index ???? ???? ????? ??? ??? ? ??, CartController? add ???? ???? ????? ??? ??? ? ????.

? ??? ThinkPHP? ???? ???? ??? ???? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!