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How to develop a simple message board and comment function using PHP

王林

Sep 20, 2023 pm 03:45 PM

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How to develop a simple message board and comment function using PHP

How to use PHP to develop simple message board and comment functions

Introduction:
Message board and comment functions are one of the common requirements in website development. It allows users to express their opinions, exchange ideas, and increase the interactivity of the website. This article will introduce how to use PHP to develop a simple message board and comment function, and provide specific code examples for readers' reference.

1. Project preparation:
Before starting development, we need to ensure that we have the following basic conditions:

A server with Apache, MySQL and PHP installed ;
A blank HTML file serves as our website template;
A database table is used to store message and comment data.

2. Create a database table:
First, we need to create a table in MySQL to store message and comment data. A simple table can be created through the following SQL statement:

CREATE TABLE messages (
    id INT PRIMARY KEY AUTO_INCREMENT,
    author VARCHAR(50) NOT NULL,
    content TEXT NOT NULL,
    timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

The table contains four fields: id, author, content and timestamp. Among them, id is the primary key and increases automatically; author is used to store the author of the message or comment; content is used to store the content of the message or comment; timestamp is used to store the timestamp of the message or comment.

3. Website template:
We need to create an HTML file as a template for the message board website. This template contains a form for users to submit comments, and an area to display comments. The following is a simple example template:

<!DOCTYPE html>
<html>
<head>
    <title>留言板</title>
    <style>
        #messages {
            margin-top: 20px;
        }
    </style>
</head>
<body>
    <h1 id="留言板">留言板</h1>
    <form action="post.php" method="post">
        <input type="text" name="author" placeholder="请输入您的姓名" required><br>
        <textarea name="content" placeholder="请输入留言内容" required></textarea><br>
        <input type="submit" value="发布留言">
    </form>
    <div id="messages">
        <!-- 留言显示区域 -->
    </div>
</body>
</html>

4. PHP code for processing messages:
We set the action attribute to "post.php" in the message board form, that is, when submitting a message, The form data is sent to the post.php file for processing. The following is a code example of the post.php file:

<?php
// 连接数据库
$host = "localhost";
$username = "root";
$password = "123456";
$database = "message_board";
$conn = mysqli_connect($host, $username, $password, $database);
if (!$conn) {
    die("数据库连接失败：" . mysqli_connect_error());
}

// 处理提交的留言
$author = $_POST['author'];
$content = $_POST['content'];
$sql = "INSERT INTO messages (author, content) VALUES ('$author', '$content')";
if (mysqli_query($conn, $sql)) {
    echo "留言发布成功";
} else {
    echo "留言发布失败：" . mysqli_error($conn);
}

// 查询数据库中的留言并显示
$sql = "SELECT * FROM messages";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {
    while ($row = mysqli_fetch_assoc($result)) {
        echo "<p>{$row['author']}: {$row['content']}</p>";
        echo "<small>{$row['timestamp']}</small><br>";
    }
}

mysqli_close($conn);
?>

5. Add comment function:
To add comment function, we need to create a table for storing comments in the database and establish it with the message form association. The following is the SQL statement to create a comment form:

CREATE TABLE comments (
    id INT PRIMARY KEY AUTO_INCREMENT,
    message_id INT,
    author VARCHAR(50) NOT NULL,
    content TEXT NOT NULL,
    timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (message_id) REFERENCES messages(id)
);

In the message display area, we can add a form to allow users to comment on each message. Comments are submitted and processed in the same way as leaving messages. You only need to add corresponding logic to the PHP code that processes comments.

Summary:
This article introduces how to use PHP to develop a simple message board and comment function. By creating database tables, writing PHP code and making website templates, we can implement the functions of user messages and comments. Readers can modify and extend the code according to their own needs and create message board functions suitable for their own projects.

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