ContactDuplicateChecker::findDuplicates

public function findDuplicates(Crm\EntityAdapter $adapter, DuplicateSearchParams $params)
{
	$result = array();
	$fieldNames = $params->getFieldNames();
	$processAllFields = empty($fieldNames);

	$lastName = ($processAllFields || in_array('LAST_NAME', $fieldNames, true)) ? $adapter->getFieldValue('LAST_NAME', '') : '';
	if($lastName !== '')
	{
		$name = ($processAllFields || in_array('NAME', $fieldNames, true)) ? $adapter->getFieldValue('NAME', '') : '';
		$secondName = ($processAllFields || in_array('SECOND_NAME', $fieldNames, true)) ? $adapter->getFieldValue('SECOND_NAME', '') : '';

		$criterion = new DuplicatePersonCriterion($lastName, $name, $secondName);
		$criterion->setCategoryId($params->getCategoryId());

		$duplicate = $criterion->find($params->getEntityTypeId() ?? \CCrmOwnerType::Undefined, 20);
		if($duplicate !== null)
		{
			$result[] = $duplicate;
		}
	}

	if($processAllFields || in_array('FM.PHONE', $fieldNames, true))
	{
		$phones = $this->findMultifieldDuplicates('PHONE', $adapter, $params);
		if(!empty($phones))
		{
			$result = array_merge($result, $phones);
		}
	}
	if($processAllFields || in_array('FM.EMAIL', $fieldNames, true))
	{
		$email = $this->findMultifieldDuplicates('EMAIL', $adapter, $params);
		if(!empty($email))
		{
			$result = array_merge($result, $email);
		}
	}

	$requisites = $this->findRequisiteDuplicates($adapter, $params);
	if (!empty($requisites))
	{
		$result = array_merge($result, $requisites);
	}

	$bankDetails = $this->findBankDetailDuplicates($adapter, $params);
	if (!empty($bankDetails))
	{
		$result = array_merge($result, $bankDetails);
	}

	return $result;
}