How can a session table be used to manage user login status and handle situations where users do not log out properly in PHP?

To manage user login status and handle situations where users do not log out properly in PHP, a session table can be used to store session IDs along with user IDs and timestamps. This table can be queried to check if a user is currently logged in or to invalidate sessions that have expired. By regularly checking and updating the session table, the application can ensure that users are logged out properly even if they do not explicitly log out. 

// Check if user is logged in
function isUserLoggedIn($userId) {
    $currentTime = time();
    $sessionTimeout = 3600; // 1 hour
    $query = "SELECT * FROM session_table WHERE user_id = $userId AND last_activity > ($currentTime - $sessionTimeout)";
    // Execute query and return true if user is logged in, false otherwise
}

// Invalidate expired sessions
function invalidateExpiredSessions() {
    $currentTime = time();
    $sessionTimeout = 3600; // 1 hour
    $query = "DELETE FROM session_table WHERE last_activity < ($currentTime - $sessionTimeout)";
    // Execute query to delete expired sessions
}

Keywords

session table user login status handle situations users log out

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