include_once example

throw new Zend_Http_UserAgent_Exception('The ' . $this->getType() . ' features adapter must have a "classname" config parameter defined');
        }

        $className = $config['classname'];
        if (!class_exists($className)) {
            if (isset($config['path'])) {
                $path = $config['path'];
            } else {
                throw new Zend_Http_UserAgent_Exception('The ' . $this->getType() . ' features adapter must have a "path" config parameter defined');
            }

            if (false === include_once ($path)) {
                throw new Zend_Http_UserAgent_Exception('The ' . $this->getType() . ' features adapter path that does not exist');
            }
        }

        return call_user_func(array($className, 'getFromRequest'), $this->_server, $this->_config);
    }

    /** * Retrieve image format support * * @return array */