How to use PHP Developer City to implement the shopping cart clearing function

How to use PHP Developer City to realize the shopping cart clearing function

With the rapid development of e-commerce, more and more mall websites are beginning to use PHP, the development language, to build their websites. As one of the very important functions of e-commerce websites, the shopping cart also requires developers to be able to operate and manage it flexibly. This article will introduce how to use the PHP Developer City to implement the shopping cart clearing function so that users can easily clear the shopping cart and re-purchase goods.

1. Create a shopping cart page
First, we need to create a shopping cart page, where users can view the selected products in the shopping cart and perform subsequent operations. On this page, there needs to be a "Clear Cart" button to clear the shopping cart.

2. Design the database table structure
In the database, we need to create a shopping cart table, which is used to store product information in the user's shopping cart. The table structure can be designed as follows:

CREATE TABLE `cart` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `user_id` INT(11) NOT NULL,
  `product_id` INT(11) NOT NULL,
  `quantity` INT(11) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Among them, id is the unique identifier of the shopping cart entry, user_id is the unique identifier of the user, product_id is the unique identifier of the product, and quantity is the quantity of the product.

3. PHP code to implement the shopping cart clearing function
Next, we need to write PHP code to implement the shopping cart clearing function. First, we need to add a "Clear Cart" button to the shopping cart page and bind it to the clear shopping cart PHP function. The code example is as follows:

<button onclick="clearCart()">清空购物车</button>

Then, we need to write the clearCart() function, which is used to clear the shopping cart. The specific code is as follows:

function clearCart() {
    // 获取当前用户的id
    $user_id = $_SESSION['user_id'];
    
    // 删除购物车表中该用户的所有商品条目
    $query = "DELETE FROM cart WHERE user_id = '$user_id'";
    $result = mysqli_query($conn, $query);
    
    // 清空购物车成功后，跳转回购物车页面
    if ($result) {
        header("Location: cart.php");
        exit();
    }
}

In this function, we first get the id of the current user, and then use the DELETE statement to delete all the product entries of the user from the shopping cart table. If the deletion operation is successful, jump back to the shopping cart page; otherwise, stay on the current page and display the corresponding error message.

4. Test the shopping cart clearing function
Finally, we need to test the shopping cart clearing function. The test steps are as follows:

1. Open the mall website and log in to the user account.
2. Browse the product list, select several products and add them to the shopping cart.
3. Enter the shopping cart page and confirm the selected products in the shopping cart.
4. Click the "Clear Cart" button.
5. The page jumps to the shopping cart page. The shopping cart should be empty at this time.

Through the above test steps, we can verify whether the shopping cart clearing function works properly.

Summary:
Through the above steps, we successfully used the PHP Developer City to implement the shopping cart clearing function. In actual development, we can further improve this function, such as adding a confirmation pop-up window or modifying the layout of the shopping cart page. However, no matter what, the shopping cart clearing function is very important. It can provide a better user experience and enable users to easily manage the shopping cart and re-purchase products. Therefore, for the development of shopping mall websites, the implementation of the shopping cart clearing function is an essential part.

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