CCrmDocument::GetDocumentAuthorID

static function GetDocumentAuthorID($documentId)
{
	if(!is_array($documentId) || count($documentId) < 3)
	{
		return 0;
	}

	$documentInfo = static::GetDocumentInfo($documentId[2]);
	$entityTypeName = isset($documentInfo['TYPE']) ? $documentInfo['TYPE'] : '';
	$entityId = isset($documentInfo['ID']) ? intval($documentInfo['ID']) : 0;

	return CCrmOwnerType::GetResponsibleID(
		CCrmOwnerType::ResolveID($entityTypeName),
		$entityId,
		false
	);
}