prepare('SELECT display_name FROM users WHERE id = ?');
$stmt->execute([$chat_with_id]);
$chat_with_user = $stmt->fetch(PDO::FETCH_ASSOC);
// Fetch messages
$stmt = $pdo->prepare('SELECT * FROM messages WHERE (sender_id = ? AND receiver_id = ?) OR (sender_id = ? AND receiver_id = ?) ORDER BY created_at ASC');
$stmt->execute([$current_user_id, $chat_with_id, $chat_with_id, $current_user_id]);
$messages = $stmt->fetchAll(PDO::FETCH_ASSOC);
?>
prepare('SELECT id, display_name FROM users WHERE id != ?');
$stmt->execute([$current_user_id]);
$users = $stmt->fetchAll(PDO::FETCH_ASSOC);
?>