// In EventHandler
$userInfo = $this->users->getFullUser(['id' => $userId]);

// In API instance
$userInfo = $MadelineProto->users->getFullUser(['id' => $userId]);

$user = $this->users->getFullUser(['id' => '@username']);

echo "Name: " . $user['users'][0]['first_name'] . "\n";
echo "Username: @" . $user['users'][0]['username'] . "\n";
echo "Bio: " . $user['full_user']['about'] . "\n";

$info = $this->getInfo($peer);

// Returns:
// - 'type' => 'user' | 'bot' | 'chat' | 'supergroup' | 'channel'
// - 'id' => numeric ID
// - 'user_id' => Telegram user ID
// - 'first_name', 'last_name', 'username'
// - 'bot' => true/false

$me = $this->getSelf();

if ($me['bot']) {
    echo "Logged in as bot: @" . $me['username'];
} else {
    echo "Logged in as user: " . $me['first_name'];
}

// From username
$id = $this->getId('@username');

// From user object
$id = $this->getId($user);

// From bot API style ID
$id = $this->getId(-1001234567890);

$fullUser = $this->users->getFullUser(['id' => $userId]);
$status = $fullUser['users'][0]['status'];

match ($status['_']) {
    'userStatusOnline' => "Online until " . date('H:i', $status['expires']),
    'userStatusOffline' => "Last seen " . date('Y-m-d H:i', $status['was_online']),
    'userStatusRecently' => "Last seen recently",
    'userStatusLastWeek' => "Last seen last week",
    'userStatusLastMonth' => "Last seen last month",
    default => "Unknown status"
};

$photos = $this->photos->getUserPhotos([
    'user_id' => $userId,
    'offset' => 0,
    'max_id' => 0,
    'limit' => 10
]);

foreach ($photos['photos'] as $photo) {
    // Download profile photo
    $this->downloadToDir($photo, '/path/to/dir/');
}

if ($this->isBot($peer)) {
    echo "This is a bot account";
}

$info = $this->getInfo($userId);
$username = $info['username'] ?? null;

if ($username) {
    echo "Username: @$username";
} else {
    echo "User has no username";
}

$fullUser = $this->users->getFullUser(['id' => $userId]);
$isPremium = $fullUser['users'][0]['premium'] ?? false;

if ($isPremium) {
    echo "This user has Telegram Premium";
}