PHPは知識問答サイトに質問の閲覧履歴や記録機能を実装しています。

CREATE TABLE `question_history` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_id` int(11) NOT NULL,
  `question_id` int(11) NOT NULL,
  `timestamp` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

function insertQuestionHistory($user_id, $question_id) {
  // 创建数据库连接
  $conn = new mysqli("localhost", "username", "password", "database");

  // 检查连接是否成功
  if ($conn->connect_error) {
    die("连接失败：" . $conn->connect_error);
  }

  // 插入记录到 question_history 表
  $sql = "INSERT INTO question_history (user_id, question_id) VALUES ('$user_id', '$question_id')";
  if ($conn->query($sql) === TRUE) {
    echo "浏览历史记录插入成功";
  } else {
    echo "插入错误：" . $conn->error;
  }

  // 关闭数据库连接
  $conn->close();
}

function getQuestionHistory($user_id) {
  // 创建数据库连接
  $conn = new mysqli("localhost", "username", "password", "database");

  // 检查连接是否成功
  if ($conn->connect_error) {
    die("连接失败：" . $conn->connect_error);
  }

  // 查询 question_history 表中的记录
  $sql = "SELECT * FROM question_history WHERE user_id = '$user_id' ORDER BY timestamp DESC";
  $result = $conn->query($sql);

  // 将查询结果转换为数组
  $history = array();
  if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
      $history[] = $row;
    }
  }

  // 关闭数据库连接
  $conn->close();

  // 返回浏览历史记录数组
  return $history;
}

$user_id = 1; // 假设用户的唯一标识符为 1

// 获取用户的浏览历史记录
$history = getQuestionHistory($user_id);

// 打印浏览历史记录
foreach ($history as $row) {
  echo "问题ID：" . $row['question_id'] . "，浏览时间：" . $row['timestamp'] . "<br>";
}