Analyse der Themendiskussion und Tag-Management-Funktionen von PHP-Social-Media-Anwendungen

// 建立数据库连接
$conn = mysqli_connect('localhost', 'username', 'password', 'database');

// 创建一个话题
function createTopic($title, $content) {
    global $conn;
    // 插入话题到数据库
    $sql = "INSERT INTO topics (title, content) VALUES ('$title', '$content')";
    mysqli_query($conn, $sql);
}

// 获取所有话题
function getTopics() {
    global $conn;
    // 从数据库中获取所有话题
    $sql = "SELECT * FROM topics";
    $result = mysqli_query($conn, $sql);
    $topics = mysqli_fetch_all($result, MYSQLI_ASSOC);
    return $topics;
}

// 创建一个话题
createTopic('PHP话题讨论', '大家一起来讨论PHP编程技巧吧！');

// 获取所有话题
$topics = getTopics();
foreach($topics as $topic) {
    echo $topic['title'] . ': ' . $topic['content'];
}

// 给话题添加标签
function addTagToTopic($topicId, $tag) {
    global $conn;
    // 插入标签到数据库
    $sql = "INSERT INTO tags (topic_id, tag) VALUES ($topicId, '$tag')";
    mysqli_query($conn, $sql);
}

// 获取话题的标签
function getTagsByTopicId($topicId) {
    global $conn;
    // 从数据库中获取话题的标签
    $sql = "SELECT tag FROM tags WHERE topic_id = $topicId";
    $result = mysqli_query($conn, $sql);
    $tags = mysqli_fetch_all($result, MYSQLI_ASSOC);
    return $tags;
}

// 给话题添加标签
addTagToTopic(1, 'PHP');
addTagToTopic(1, '编程');

// 获取话题的标签
$tags = getTagsByTopicId(1);
foreach($tags as $tag) {
    echo $tag['tag'];
}