public function enableAdmin($admin_id)
{
if (is_int($admin_id) && $admin_id > 0 && !in_array($admin_id, $this->admins_list, true)) {
$this->admins_list[] = $admin_id;
} else {
TelegramLog::error('Invalid value "' . $admin_id . '" for admin.');
}
return $this;
}