PHP (Hypertext Preprocessor) is an open source scripting language that is widely used in web development. In web development, message boards are a common feature. In order to allow users to leave messages on your website, you can use PHP to implement a simple message board.

Here is a simple message board example, let's see how to implement it using PHP:

1. Create database

First, we need Create a database and a table in MySQL to store comments. In MySQL, you can use the following statements to create:

CREATE DATABASE message_board;
USE message_board;

CREATE TABLE messages (
id INT(11) AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(255) NOT NULL,
message TEXT NOT NULL,
created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

The above statement will create a database named message_board, which contains a name A table for messages. The messages table contains four columns: id, name, message and created_at. The id column is the unique identifier of the message, the name column is the name of the message sender, the message column is the message content, and the created_at column is the time when the message was created.

2. Create form

Next, we need to create a form on the website to enable users to leave messages on the message board. We can use HTML language to create forms:

Message Board

<label for="name">名称：</label>
<input type="text" name="name" id="name" required>
<br>
<label for="message">留言：</label>
<textarea name="message" id="message" required></textarea>
<br>
<input type="submit" value="提交">

The above code will create a form with name and message input boxes, and a Submit button. The action of the form is to point to the message.php page.

3. Processing form data

When a user submits a form, we need to use PHP to accept the form data and save it to the database. We can use the following code to process the form data:

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$name = $_POST[' name'];
$message = $_POST['message'];
$mysqli = new mysqli("localhost", "username", "password", "message_board");
if ($ mysqli->connect_error) {

die('数据库连接失败：' . $mysqli->connect_error);

}
$sql = "INSERT INTO messages (name, message) VALUES ('$name', '$message')";
if ($ mysqli->query($sql) === TRUE) {

echo '留言已提交';

} else {

echo '错误： ' . $mysqli->error;

}
$mysqli->close();
}
?>

The above code will accept the name and message of the form and insert it into the messages table in the database we created earlier.

4. Display Messages

Finally, we need to use PHP to retrieve all the messages from the database and display them on the website. We can use the following code:

$mysqli = new mysqli("localhost", "username", "password", "message_board");
if ($mysqli- >connect_error) {
die('Database connection failed: ' . $mysqli->connect_error);
}
$sql = "SELECT * FROM messages ORDER BY created_at DESC";
$ result = $mysqli->query($sql);
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {

echo '<div>';
echo '<h3>' . $row['name'] . '</h3>';
echo $row['message'];
echo '<p>' . $row['created_at'] . '</p>';
echo '</div>';

}
} else {
echo 'There are currently no messages. ';
}
$mysqli->close();
?>

The above code will retrieve all comments from the database and display them on the website.

Through the implementation of the above steps, we can already implement a simple message board on our website. Of course, this is just a basic example and you can extend it in the future as needed.

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