Second-hand recycling website uses transaction evaluation system developed by PHP

Second-hand recycling website uses a transaction evaluation system developed by PHP

With the development of the Internet, the second-hand recycling industry is gradually emerging, and more and more people choose to buy and sell second-hand items online. In order to improve the transaction experience for buyers and sellers and ensure the reliability of transactions, the second-hand recycling website has developed a transaction evaluation system. This article will introduce how this evaluation system is developed using PHP language, and provide code examples for demonstration.

The development of the transaction evaluation system is based on PHP language and mainly includes evaluation functions, scoring functions and comment functions. First, we need to create a database to store user evaluation information. The following is a sample code for creating a database table:

CREATE TABLE `evaluation` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_id` int(11) NOT NULL,
  `order_id` int(11) NOT NULL,
  `score` int(11) NOT NULL,
  `comment` text,
  `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

The above code creates a database table named evaluation, which contains fields such as id, user_id, order_id, score, comment, and create_time. Among them, id is the unique identifier of the evaluation, user_id is the ID of the evaluation user, order_id is the order ID associated with the evaluation, score is the rating, comment is the content of the evaluation, and create_time is the creation time of the evaluation.

Next, we need to write PHP code to implement the evaluation function. The following is a simple sample code:

<?php
// 连接数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// 处理评价请求
if (isset($_POST['user_id']) && isset($_POST['order_id']) && isset($_POST['score']) && isset($_POST['comment'])) {
    $user_id = $_POST['user_id'];
    $order_id = $_POST['order_id'];
    $score = $_POST['score'];
    $comment = $_POST['comment'];

    // 插入评价信息
    $sql = "INSERT INTO evaluation (user_id, order_id, score, comment)
    VALUES ('$user_id', '$order_id', '$score', '$comment')";

    if ($conn->query($sql) === TRUE) {
        echo "评价成功";
    } else {
        echo "评价失败: " . $conn->error;
    }
}

// 展示评价列表
$sql = "SELECT * FROM evaluation";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "评价ID: " . $row["id"]. " - 用户ID: " . $row["user_id"]. " - 订单ID: " . $row["order_id"]. " - 评分: " . $row["score"]. " - 评论: " . $row["comment"]. "<br>";
    }
} else {
    echo "暂无评价";
}

$conn->close();
?>

In the above code, we first connect to the database and then process the evaluation request. Obtain the evaluation user's ID, order ID, rating and comment content through $_POST, and insert this information into the database. Finally, we query the database and display the list of reviews.

In addition to the evaluation function, the transaction evaluation system also includes a scoring function and a comment function. Through the rating function, buyers and sellers can rate each other to reflect the satisfaction of the transaction; through the comment function, users can explain the transaction in more detail. Based on the above sample code, corresponding extensions and modifications can be made.

To sum up, the second-hand recycling website uses the transaction evaluation system developed by PHP to provide users with a convenient evaluation platform. The system realizes functions such as evaluation, scoring and commenting by leveraging the powerful functions of PHP language, and provides users with convenient and reliable transaction evaluation services through database storage and query operations. For second-hand recycling websites, the development of this evaluation system plays an important role in improving user experience and promoting website development.

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