CAllCrmDeal::IsStageExists

static function IsStageExists($stageID, $categoryID = -1, array $params = [])
{
	$stageID = (string)$stageID;
	$categoryID = (int)$categoryID;

	if($categoryID < 0)
	{
		$categoryID = DealCategory::resolveFromStageID($stageID);
	}

	if (isset($params['viewMode']) && $params['viewMode'] === ViewMode::MODE_ACTIVITIES)
	{
		$entityActivities = new Crm\Kanban\Entity\EntityActivities(\CCrmOwnerType::Deal, $categoryID);
		$stageList = array_flip(
			array_column($entityActivities->getStagesList($categoryID), 'STATUS_ID')
		);
	}
	else
	{
		$stageList = self::GetStages($categoryID);
	}

	return isset($stageList[$stageID]);
}