队列技术在PHP与MySQL中的消息排序和消息合并的应用

// 创建订单消息队列
$queue = new SplQueue();

// 从数据库中读取订单信息并加入队列
$sql = "SELECT * FROM orders ORDER BY submit_time ASC";
$result = mysqli_query($conn, $sql);
while ($row = mysqli_fetch_assoc($result)) {
    $queue->enqueue($row);
}

// 按照顺序处理订单信息
while (!$queue->isEmpty()) {
    $order = $queue->dequeue();
    // 执行订单处理逻辑
    // ...
}

// 创建评论消息队列
$queue = [];

// 从数据库中读取评论信息并合并
$sql = "SELECT * FROM comments ORDER BY user_id ASC, submit_time ASC";
$result = mysqli_query($conn, $sql);
while ($row = mysqli_fetch_assoc($result)) {
    $user_id = $row['user_id'];
    if (!isset($queue[$user_id])) {
        $queue[$user_id] = '';
    }
    $queue[$user_id] .= $row['content'] . ' ';
}

// 显示合并后的评论
foreach ($queue as $user_id => $comment) {
    echo "用户{$user_id}的评论：{$comment}";
}