Manager::isB24

static function isB24(): bool
{
	static $return = null;

	if (self::$forceB24disable === true)
	{
		return false;
	}

	if ($return === null)
	{
		if (
			defined('LANDING_DISABLE_B24_MODE') &&
			LANDING_DISABLE_B24_MODE === true
		)
		{
			$return = false;
		}
		else
		{
			$return = ModuleManager::isModuleInstalled('bitrix24') ||
						ModuleManager::isModuleInstalled('crm') ||
						ModuleManager::isModuleInstalled('intranet');
		}
	}

	return $return;
}