Flow\JSONPath\Filters\IndexFilter::filter PHP Method

    public function filter($collection)
    {
        if (AccessHelper::keyExists($collection, $this->token->value, $this->magicIsAllowed)) {
            return [AccessHelper::getValue($collection, $this->token->value, $this->magicIsAllowed)];
        } else {
            if ($this->token->value === "*") {
                return AccessHelper::arrayValues($collection);
            }
        }
        return [];
    }