Queue::isInQueue

static function isInQueue(int $userId): bool
{
	if (!array_key_exists($userId, self::$inQueue))
	{
		$res = QueueTable::getRow([
			'filter' => [
				'=USER_ID' => $userId
			]
		]);

		self::$inQueue[$userId] = (bool) $res;
	}

	return self::$inQueue[$userId];
}