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How to use PHP to develop a simple message board function

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Sep 21, 2023 pm 04:22 PM

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How to use PHP to develop a simple message board function

Use PHP to develop a simple message board function

The message board is a very common website function, which allows users to post messages, comments and other content on the website. In this article, we will use the PHP programming language to develop a simple message board functionality. First, we need a PHP environment containing a database. Next, we will introduce step by step how to implement the message board function.

Create database
First, we need to create a database to store the content of messages. You can use a database management system such as MySQL to create a database named "guestbook" and create a data table named "messages", which contains the following fields:
id: auto-increment primary key
name: user name (varchar type)
message: message content (text type)
date: message time (timestamp type)
Connect to the database
In In the PHP code, we need to connect to the database in order to read and write data. You can use the following code to connect to the database:

<?php
$servername = "localhost";
$username = "root";
$password = "password";
$dbname = "guestbook";

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("连接失败：" . $conn->connect_error);
}

echo "连接成功";
?>

Display messages
Next, we need to read the messages from the database and display them on the web page. You can use the following code to read messages from the database:

<?php
// SQL查询语句
$sql = "SELECT * FROM messages";

// 执行查询
$result = $conn->query($sql);

// 检查查询结果是否为空
if ($result->num_rows > 0) {
    // 输出每一条留言
    while ($row = $result->fetch_assoc()) {
        echo "用户名：" . $row["name"] . "<br>";
        echo "留言内容：" . $row["message"] . "<br>";
        echo "留言时间：" . $row["date"] . "<br><br>";
    }
} else {
    echo "暂无留言";
}

// 关闭数据库连接
$conn->close();
?>

Submit messages
In addition to reading messages, we also need to provide a form to allow users to submit messages. You can use the following code to implement the message submission function:

<?php
// 检查用户是否提交了留言
if (isset($_POST["submit"])) {
    // 获取用户输入的用户名和留言内容
    $name = $_POST["name"];
    $message = $_POST["message"];

    // 插入数据到数据库
    $sql = "INSERT INTO messages (name, message) VALUES ('$name', '$message')";

    if ($conn->query($sql) === TRUE) {
        echo "留言成功";
    } else {
        echo "留言失败：" . $conn->error;
    }
}

// 关闭数据库连接
$conn->close();
?>

<html>
<body>
    <form method="post" action="">
        <label for="name">用户名：</label>
        <input type="text" name="name" id="name"><br>

        <label for="message">留言内容：</label>
        <textarea name="message" id="message" rows="5" cols="30"></textarea><br>

        <input type="submit" name="submit" value="提交留言">
    </form>
</body>
</html>

The above is all the code for using PHP to develop a simple message board function. Through the above steps, we can create a simple message board with message display and message submission functions. The code can be expanded and optimized as needed, such as adding user verification, comment reply and other functions. Hope this article helps you!

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