Locker\Repository\Statement\EloquentLinker::upRefs PHP Method

    private function upRefs(\stdClass $statement, StoreOptions $opts, $useInitialUpRefs)
    {
        if ($useInitialUpRefs) {
            if (isset($this->upRefStatements[$statement->id])) {
                return $this->upRefStatements[$statement->id];
            }
            return new Collection();
        }
        return $this->fetchUpRefs($statement, $opts);
    }