ImportHelper::parseEntityKey

private function parseEntityKey($row)
{
	$keyValue = '';

	if (is_array($row))
	{
		foreach ($this->entityKeyFields as $fieldName)
		{
			if (isset($this->headerIndex[$fieldName]))
			{
				$index = $this->headerIndex[$fieldName];
				if (isset($row[$index]))
					$keyValue .= strval($row[$index]);
			}
		}
	}

	return $keyValue;
}