Second-hand recycling website developed using PHP supports auction function

The second-hand recycling website developed using PHP supports the auction function

In the current social environment, resource recycling and reuse has become an important ecological and environmental protection method. In order to facilitate people to reuse idle items, more and more second-hand recycling websites have emerged. However, in order to further meet user needs and provide users with more convenient transaction methods, many second-hand recycling websites have begun to introduce auction functions, allowing users to obtain their favorite items through bidding. This article will introduce how to implement the auction function on a second-hand recycling website developed using PHP.

1. Database design

Before implementing the auction function, you first need to design the database. We can use MySQL as the database management system and create the following two tables in the database: product table and bid table.

1. Product table

The product table is used to store information about all items to be auctioned, including product name, description, starting price, current highest price, end time and other fields. The specific table structure example is as follows:

CREATE TABLE `items` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) NOT NULL,
  `description` varchar(255) NOT NULL,
  `start_price` decimal(10,2) NOT NULL,
  `current_price` decimal(10,2) DEFAULT NULL,
  `end_time` datetime NOT NULL,
  PRIMARY KEY (`id`)
);

2. Bid table

The bid table is used to store the bidding information of users participating in the auction, including product ID, user ID, bid price, etc. Field and associated with the product table. The specific table structure example is as follows:

CREATE TABLE `bids` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `item_id` int(11) NOT NULL,
  `user_id` int(11) NOT NULL,
  `price` decimal(10,2) NOT NULL,
  PRIMARY KEY (`id`),
  FOREIGN KEY (`item_id`) REFERENCES `items`(`id`),
  FOREIGN KEY (`user_id`) REFERENCES `users`(`id`)
);

2. Website front-end design

1. Product list page

Display on the homepage or product list page of the website Information about items to be auctioned, including product name, description, starting price, current highest price, etc. At the same time, a countdown to the end time of each item needs to be displayed. Users can click on the item to enter the auction details page.

2. Auction details page

On the auction details page, the detailed information of the current item is displayed, including product name, description, starting price, current highest price, remaining time, etc. At the same time, it is also necessary to display the bidding information of users currently participating in the auction, including user nicknames, bidding prices, etc. Users can bid on this page.

3. Website back-end development

1. Auction item display

Display the information of items to be auctioned on the website by querying the commodity table in the database on the front-end page.

<?php
// 查询所有待拍卖的物品信息
$sql = "SELECT * FROM items";
$result = mysqli_query($conn, $sql);
while ($row = mysqli_fetch_assoc($result)) {
    echo $row['name'] . ' - ' . $row['description'];
    echo '起拍价：' . $row['start_price'];
    echo '当前最高价：' . $row['current_price'];
    echo '结束时间：' . $row['end_time'];
}
?>

2. User bidding operation

When the user performs a bidding operation on the auction details page, the user's bidding information is inserted into the bidding table.

<?php
if (isset($_POST['submit'])) {
    // 获取用户提交的出价数据
    $itemId = $_POST['item_id'];
    $userId = $_POST['user_id'];
    $price = $_POST['price'];
    
    // 将用户出价插入到出价表中
    $sql = "INSERT INTO bids (item_id, user_id, price) VALUES ('$itemId', '$userId', '$price')";
    mysqli_query($conn, $sql);
    
    // 更新商品表中的当前最高价字段
    $sql = "UPDATE items SET current_price = '$price' WHERE id = '$itemId'";
    mysqli_query($conn, $sql);
}
?>

4. Security considerations

When developing the auction function, the security of user data needs to be taken into consideration. The following measures can be taken:

1. Filter and verify user-entered data to prevent SQL injection and XSS attacks.
2. In the user bidding operation, the bid price can be verified to ensure that the bid is higher than the current highest price.
3. In the user bidding operation, user login verification can be performed, and only logged-in users can participate in the auction.

5. Summary

Through the above code examples, we can see how a second-hand recycling website developed using PHP can implement the auction function. Such a function allows users to obtain their favorite items through bidding, and also brings more trading opportunities to second-hand recycling websites. Of course, more details and requirements need to be taken into consideration during the actual development process, but the above framework can provide a good starting point for the development team.

Finally, I hope that more second-hand recycling websites can introduce auction functions to promote the recycling of resources and make positive contributions to environmental protection.

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