Analysis of the mall and transaction functions of PHP social media applications

#PHP Analysis of the Mall and Transaction Functions of Social Media Applications

With the rapid development of social media, more and more people are beginning to shop on social media platforms and trading activities. In order to meet the needs of users, many social media applications have begun to add shopping malls and transaction functions. This article will use the PHP programming language to explain how to implement these functions and provide code examples.

1. Mall function
   Adding a mall function to a social media application can provide users with a centralized shopping platform. Users can browse products in the mall, add them to the shopping cart, and make payments. The following are the key steps to implement the mall function:
2. Create a product list and product details page
   First, you need to create a product list page to display all product information. You can use a database to store product-related information, such as name, price, description, etc. On the product details page, display detailed information about the product and provide an add to cart button.

Code example:

// 商品列表页面
$sql = "SELECT * FROM products";
$result = mysqli_query($conn, $sql);

while ($row = mysqli_fetch_assoc($result)) {
  echo $row['name'];
  echo $row['price'];
  echo $row['description'];
  echo "<a href="product_details.php?id=".$row['id']."">详情</a>";
}

// 商品详情页面
$id = $_GET['id'];
$sql = "SELECT * FROM products WHERE id = $id";
$result = mysqli_query($conn, $sql);

$row = mysqli_fetch_assoc($result);
echo $row['name'];
echo $row['price'];
echo $row['description'];
echo "<button onclick="addToCart(".$row['id'].")">添加到购物车</button>";

2. Shopping Cart Function
   Shopping Cart Function allows users to add multiple items to the shopping cart and do it all at once during checkout Pay. The following are the key steps to implement the shopping cart function:

1) Create a shopping cart page
On the shopping cart page, display the product information added by the user to the shopping cart and provide a delete button.

Code example:

// 购物车页面
$sql = "SELECT * FROM cart_items WHERE user_id = $user_id";
$result = mysqli_query($conn, $sql);

while ($row = mysqli_fetch_assoc($result)) {
  echo $row['product_name'];
  echo $row['product_price'];
  echo "<button onclick="removeFromCart(".$row['id'].")">删除</button>";
}

2) Add product to shopping cart
When the user clicks the add to shopping cart button, store the product information in the shopping cart database.

Code example:

// 添加商品到购物车
$product_id = $_GET['id'];
$sql = "INSERT INTO cart_items (user_id, product_id, product_name, product_price) VALUES ($user_id, $product_id, '$product_name', $product_price)";
mysqli_query($conn, $sql);

3) Delete products from the shopping cart
When the user clicks the delete button, delete the corresponding product information from the shopping cart database.

Code example:

// 从购物车删除商品
$item_id = $_GET['item_id'];
$sql = "DELETE FROM cart_items WHERE id = $item_id";
mysqli_query($conn, $sql);

3. Transaction function
   The transaction function allows users to pay for items in the shopping cart and update inventory and order information. The following are the key steps to implement the transaction function:

1) Create an order
When a user makes a payment, an order needs to be created and the product information in the shopping cart is stored in the order database.

Code example:

// 创建订单
$sql = "INSERT INTO orders (user_id, product_id, product_name, product_price) SELECT user_id, product_id, product_name, product_price FROM cart_items WHERE user_id = $user_id";
mysqli_query($conn, $sql);

2) Update inventory
After creating an order, you need to update the product inventory information, that is, subtract the number of products in the shopping cart from the product inventory.

Code example:

// 更新库存
$sql = "UPDATE products INNER JOIN cart_items ON products.id = cart_items.product_id SET products.stock = products.stock - cart_items.quantity WHERE cart_items.user_id = $user_id";
mysqli_query($conn, $sql);

3) Clear the shopping cart
After completing the payment, you need to clear the shopping cart, that is, delete the shopping cart product information of the corresponding user in the shopping cart database.

Code examples:

// 清空购物车
$sql = "DELETE FROM cart_items WHERE user_id = $user_id";
mysqli_query($conn, $sql);

This article uses the PHP programming language as an example to analyze the implementation of the mall and transaction functions in social media applications, and provides corresponding code examples. Implementing mall and transaction functions can provide users with a more convenient shopping experience and bring more business opportunities to social media applications. Readers can choose the technical implementation method that suits them based on specific needs and platforms.

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