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

Title: An order evaluation system developed by second-hand recycling website using PHP

Introduction:
With the development and growth of the second-hand recycling market, more and more people choose to recycle items they no longer use. Used recycling websites for transactions. In order to improve user experience and evaluate service quality, it is very important to develop an order evaluation system. This article will introduce how to use PHP to develop a simple and practical order evaluation system to help second-hand recycling websites improve user satisfaction and service quality.

1. Design the database
We first need to design the database. In this example, we will create two tables: user table and order evaluation table.

The structure of the user table is as follows:

CREATE TABLE users (
id INT(11) AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(50) NOT NULL,
password VARCHAR (255) NOT NULL
);

The structure of the order rating table is as follows:

CREATE TABLE ratings (
id INT(11) AUTO_INCREMENT PRIMARY KEY,
user_id INT (11) NOT NULL,
order_id INT(11) NOT NULL,
rating INT(1) NOT NULL,
comment TEXT,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

2. Build a front-end interface
In order to facilitate users to submit reviews, we need to build a simple front-end interface. In this example, we will create a review page for users to submit reviews.

The HTML code of the evaluation page is as follows:

Order Rating

<input type="hidden" name="order_id" value="<?php echo $_GET['order_id']; ?>">
<label for="rating">评分（1-5）：</label>
<select name="rating" id="rating">
  <option value="1">1</option>
  <option value="2">2</option>
  <option value="3">3</option>
  <option value="4">4</option>
  <option value="5">5</option>
</select>
<br>
<label for="comment">评论：</label>
<textarea name="comment" id="comment"></textarea>
<br>
<input type="submit" value="提交评价">

3. Write PHP script
Save the evaluation data submitted by the user into the database through the PHP script.

The code of submit_rating.php is as follows:

// Connect to the database
$conn = mysqli_connect("localhost", "username", "password", "database");

// Check whether the connection is successful
if (!$conn) {
die("Database connection failed:" . mysqli_connect_error());
}

// Get the evaluation data submitted by the user
$order_id = $_POST['order_id'];
$rating = $_POST['rating'];
$comment = $_POST[' comment'];

// Get the current user ID, which can be obtained from the session or login information
$user_id = 1;

// Insert the evaluation data into the database
$sql = "INSERT INTO ratings (user_id, order_id, rating, comment) VALUES ('$user_id', '$order_id', '$rating', '$comment')";

if (mysqli_query ($conn, $sql)) {
echo "Evaluation submission successful!";
} else {
echo "Evaluation submission failed:" . mysqli_error($conn);
}

//Close the database connection
mysqli_close($conn);
?>

4. Improve the back-end logic
In order to ensure the integrity and stability of the evaluation system, we Some additional code needs to be written, such as verification of whether the user is logged in and checking of rated orders.

To simplify the example, we added a line of comments in submit_rating.php to indicate that the current user ID can be obtained from the session or login information. In actual application, please modify and verify according to your own needs.

Conclusion:
Through the above steps, we successfully developed a simple and practical order evaluation system using PHP. This system can help second-hand recycling websites improve user satisfaction and service quality, and improve transaction trust and success rate. Of course, you can further expand and improve this basic system according to actual needs. I hope this article can be helpful to developers and users of second-hand recycling websites.

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