CCrmActivityTask::GetList

public function GetList($arOrder = Array('CREATED_DATE' => 'DESC'), $arFilter = Array(), $arSelect = Array(), $nPageTop = false) 
{		
	$ENTITY_ID = 'TASKS_TASK';
	$arElement = $GLOBALS['USER_FIELD_MANAGER']->GetUserFields($ENTITY_ID, 0, LANGUAGE_ID);    

	if ($arElement == false || !isset($arElement['UF_CRM_TASK']))
	{		
		$arFields = array();
		$arFields['ENTITY_ID'] = $ENTITY_ID;
		$arFields['FIELD_NAME'] = 'UF_CRM_TASK';
		$arFields['USER_TYPE_ID'] = 'crm';
		$arFields['EDIT_FORM_LABEL'][LANGUAGE_ID] = GetMessage('CRM_UF_NAME');
		$arFields['LIST_COLUMN_LABEL'][LANGUAGE_ID] = GetMessage('CRM_UF_NAME');
		$arFields['LIST_FILTER_LABEL'][LANGUAGE_ID] = GetMessage('CRM_UF_NAME');
		$arFields['SETTINGS']['LEAD'] = 'Y';
		$arFields['SETTINGS']['CONTACT'] = 'Y';
		$arFields['SETTINGS']['COMPANY'] = 'Y';
		$arFields['SETTINGS']['DEAL'] = 'Y';
		$arFields['MULTIPLE'] = 'Y';
		$CAllUserTypeEntity = new CUserTypeEntity();
		$CAllUserTypeEntity->Add($arFields);		
	}

	$entityTypeId = \CCrmOwnerType::ResolveID($arFilter['ENTITY_TYPE'] ?? '');
	if (
		$entityTypeId > 0
		&& isset($arFilter['ENTITY_ID'])
		&& (int)$arFilter['ENTITY_ID'] > 0
	)
	{
		$arFilter['UF_CRM_TASK'] = \Bitrix\Crm\UserField\Types\ElementType::getValueByIdentifier(
			new \Bitrix\Crm\ItemIdentifier(
				(int)$arFilter['ENTITY_TYPE'],
				(int)$arFilter['ENTITY_ID']
			)
		);
		unset($arFilter['ENTITY_TYPE'], $arFilter['ENTITY_ID']);
	}
	else if (isset($arFilter['ENTITY_TYPE']))
	{

		if(!empty($arFilter['ENTITY_TYPE']))
		{
			$arFilter['ENTITY_TYPE'] = CUserTypeCrm::GetShortEntityType($arFilter['ENTITY_TYPE']);
			$arFilter['%UF_CRM_TASK'] = $arFilter['ENTITY_TYPE'].'_';
		}
		else
		{
			$arFilter['!=UF_CRM_TASK'] = '';
		}
		unset($arFilter['ENTITY_TYPE']);			
	}
	else
	{
		$arFilter['!=UF_CRM_TASK'] = '';
	}

	if (isset($arFilter['TITLE'])) 
	{
		$arFilter['%TITLE'] = $arFilter['TITLE'];
		unset($arFilter['TITLE']);
	}
	if (isset($arFilter['REAL_STATUS']))
	{
		$arFilter['STATUS'] = $arFilter['REAL_STATUS'];
		unset($arFilter['REAL_STATUS']);			
	}
	if (isset($arOrder['ID']) || isset($arOrder['id']))
		$arSelect[] = 'ID';
	if (in_array('RESPONSIBLE_ID', $arSelect))
	{
		$arSelect[] = 'RESPONSIBLE_NAME';
		$arSelect[] = 'RESPONSIBLE_LAST_NAME';
		$arSelect[] = 'RESPONSIBLE_SECOND_NAME';
		$arSelect[] = 'RESPONSIBLE_LOGIN';
	}
		
	$obRes = CTasks::GetList($arOrder, $arFilter, $arSelect, $nPageTop);
	return $obRes;
}