How do popular forum platforms like PHPBB handle displaying online users, and can this be replicated in custom PHP scripts?
Popular forum platforms like PHPBB typically handle displaying online users by storing user activity in a database table and updating it regularly. This information is then queried and displayed on the forum's interface to show which users are currently online. To replicate this functionality in custom PHP scripts, you can create a similar database table to store user activity timestamps and then query this table to display online users.
// Assuming you have a database connection established
// Update user activity timestamp in the database
$user_id = $_SESSION['user_id']; // Assuming you have a user ID stored in the session
$current_timestamp = time();
$query = "UPDATE users SET last_activity = $current_timestamp WHERE user_id = $user_id";
mysqli_query($conn, $query);
// Query database to get online users
$online_threshold = time() - 300; // Users who have been active in the last 5 minutes
$query = "SELECT * FROM users WHERE last_activity > $online_threshold";
$result = mysqli_query($conn, $query);
// Display online users
while($row = mysqli_fetch_assoc($result)) {
echo $row['username'] . " is online<br>";
}