function isLoggedIn() {
    return isset($_SESSION['user_id']);
}

function isAdmin() {
    return isset($_SESSION['role']) && $_SESSION['role'] === 'admin';
}

function redirect($url) {
    header("Location: $url");
    exit;
}

function logAction($user_id, $action, $details = '') {
    global $conn;

    $user_id = (int)$user_id;

    $stmt = $conn->prepare("
        INSERT INTO logs (user_id, action, details, ip_address)
        VALUES (?, ?, ?, ?)
    ");

    $ip = $_SERVER['REMOTE_ADDR'] ?? '';

    $stmt->bind_param(
        "isss",
        $user_id,
        $action,
        $details,
        $ip
    );

    $stmt->execute();
}<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function isLoggedIn() in /home/u356286985/domains/assafchat.com/public_html/index.php:7
Stack trace:
#0 {main}
  thrown in <b>/home/u356286985/domains/assafchat.com/public_html/index.php</b> on line <b>7</b><br />