Zendesk\API\HttpClient::getSideload PHP Method

    public function getSideload(array $params = [])
    {
        // Allow both for backward compatibility
        $sideloadKeys = array('include', 'sideload');
        if (!empty($sideloads = array_intersect_key($params, array_flip($sideloadKeys)))) {
            // Merge to a single array
            return call_user_func_array('array_merge', $sideloads);
        } else {
            return $this->sideload;
        }
    }