PHP は、ナレッジ Q&A Web サイトに質問のディスカッションと回答の編集機能を実装します。

CREATE TABLE questions (
    id INT(11) AUTO_INCREMENT PRIMARY KEY,
    title VARCHAR(255) NOT NULL,
    content TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE answers (
    id INT(11) AUTO_INCREMENT PRIMARY KEY,
    question_id INT(11) NOT NULL,
    content TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

<?php
// 连接数据库
$conn = mysqli_connect("localhost", "username", "password", "database");

// 查询所有问题
$query = "SELECT * FROM questions ORDER BY created_at DESC";
$result = mysqli_query($conn, $query);

// 显示问题列表
while ($row = mysqli_fetch_assoc($result)) {
    echo "<h2><a href='question.php?id={$row['id']}'>{$row['title']}</a></h2>";
    echo "<p>{$row['content']}</p>";
    echo "<hr>";
}
?>

<?php
// 连接数据库
$conn = mysqli_connect("localhost", "username", "password", "database");

// 获取问题 ID
$id = $_GET['id'];

// 查询问题的详细信息
$query = "SELECT * FROM questions WHERE id = $id";
$result = mysqli_query($conn, $query);
$question = mysqli_fetch_assoc($result);

// 查询问题的答案列表
$query = "SELECT * FROM answers WHERE question_id = $id ORDER BY created_at DESC";
$result = mysqli_query($conn, $query);

// 显示问题和答案
echo "<h1>{$question['title']}</h1>";
echo "<p>{$question['content']}</p>";

while ($row = mysqli_fetch_assoc($result)) {
    echo "<h3>答案</h3>";
    echo "<p>{$row['content']}</p>";
    echo "<hr>";
}
?>

<?php
// 连接数据库
$conn = mysqli_connect("localhost", "username", "password", "database");

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // 提交问题
    if (isset($_POST['question'])) {
        $title = $_POST['title'];
        $content = $_POST['content'];

        $query = "INSERT INTO questions (title, content) VALUES ('$title', '$content')";
        mysqli_query($conn, $query);
    }

    // 提交答案
    if (isset($_POST['answer'])) {
        $question_id = $_POST['question_id'];
        $content = $_POST['content'];

        $query = "INSERT INTO answers (question_id, content) VALUES ($question_id, '$content')";
        mysqli_query($conn, $query);
    }

    // 重定向到问题详情页面
    header("Location: question.php?id=$question_id");
    exit();
}
?>