FieldInfo::splitFieldPath

public function splitFieldPath(string $fieldPathName): array
{
	$result = [
		'path' => '',
		'name' => '',
	];

	$dotPos = mb_strrpos($fieldPathName, '.');
	if ($dotPos === false)
	{
		$result['path'] = '';
		$result['name'] = $fieldPathName;
	}
	else
	{
		$result['path'] = substr($fieldPathName, 0, $dotPos);
		$result['name'] = substr($fieldPathName, $dotPos + 1);
	}

	return $result;
}