How to use PHP to implement a simple message board version 2.0
With the rapid development of the Internet, message boards have become an important part of many websites. Message boards not only provide a platform for users to interact with the website, but also help website administrators understand users' real-time feedback and opinions. In this article, we will introduce how to use PHP to implement a simple message board version 2.0, including the functions of publishing, displaying and deleting messages.
1. Preparation
Before you start, make sure you have installed PHP and a MySQL database server. At the same time, you also need to create a new database on your web server and create a user to access this database.
2. Create a database table
First, create a table named "messages" in your MySQL database to store message information. This table can contain the following fields:
- id: the unique identifier of the message, using an auto-incrementing primary key.
- name: The name of the person who left the message.
- email: The email address of the person who left the message.
- content: The content of the message.
- created_at: The creation time of the message, using MySQL's "timestamp" type.
3. Create a message board page
Create a file named "index.php" and write the following HTML code:
<!DOCTYPE html>
<html>
<head>
<title>留言板</title>
</head>
<body>
<h1 id="欢迎来到留言板">欢迎来到留言板</h1>
<h2 id="发布留言">发布留言</h2>
<form action="post_message.php" method="post">
<label for="name">姓名：</label>
<input type="text" name="name" id="name"><br>
<label for="email">邮箱：</label>
<input type="email" name="email" id="email"><br>
<label for="content">内容：</label><br>
<textarea name="content" id="content" rows="5" cols="50"></textarea><br>
<input type="submit" value="发布留言">
</form>
<h2 id="留言列表">留言列表</h2>
<?php
// 在这里编写PHP代码用于显示留言列表
?>
</body>
</html>4. Process the posting of messages
Create a file named "post_message.php" and write the following PHP code:
<?php
// 连接到数据库
$conn = new mysqli("localhost", "username", "password", "database");
// 检查连接是否成功
if ($conn->connect_error) {
die("连接数据库失败: " . $conn->connect_error);
}
// 检查是否有通过POST请求提交的留言
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$name = $_POST["name"];
$email = $_POST["email"];
$content = $_POST["content"];
// 准备SQL语句，并将留言插入到数据库中
$sql = "INSERT INTO messages (name, email, content) VALUES ('$name', '$email', '$content')";
if ($conn->query($sql) === TRUE) {
echo "留言发布成功";
header("Location: index.php");
} else {
echo "出现错误: " . $conn->error;
}
}
// 关闭与数据库的连接
$conn->close();
?>5. Display the message list
Add the following PHP code in the "index.php" file , used to display the message list:
<?php
// 连接到数据库
$conn = new mysqli("localhost", "username", "password", "database");
// 检查连接是否成功
if ($conn->connect_error) {
die("连接数据库失败: " . $conn->connect_error);
}
// 查询数据库中的留言列表
$sql = "SELECT * FROM messages";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
echo "<p>姓名：" . $row["name"] . "</p>";
echo "<p>邮箱：" . $row["email"] . "</p>";
echo "<p>内容：" . $row["content"] . "</p>";
echo "<hr>";
}
} else {
echo "暂时没有留言";
}
// 关闭与数据库的连接
$conn->close();
?> 6. Deletion of messages
Add the following PHP code in the "index.php" file to realize the deletion function of messages:
<?php
// 连接到数据库
$conn = new mysqli("localhost", "username", "password", "database");
// 检查连接是否成功
if ($conn->connect_error) {
die("连接数据库失败: " . $conn->connect_error);
}
// 检查是否有通过GET请求提交的删除操作
if ($_SERVER["REQUEST_METHOD"] == "GET" && isset($_GET["delete"])) {
$deleteId = $_GET["delete"];
// 准备SQL语句，并从数据库中删除指定的留言
$sql = "DELETE FROM messages WHERE id = $deleteId";
if ($conn->query($sql) === TRUE) {
echo "留言删除成功";
header("Location: index.php");
} else {
echo "出现错误: " . $conn->error;
}
}
// 关闭与数据库的连接
$conn->close();
?>Now, you can try to access the "index.php" file to test the functions of publishing, displaying and deleting messages.
Summary:
Through the introduction of this article, you have learned to use PHP to implement a simple message board version 2.0. You can further customize and expand according to your own needs, such as adding editing functions, user login functions, etc. Hope this article can be helpful to you!
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