Zend_Http_UserAgent_Exception example

    protected function _loadFeaturesAdapter()
    {
        $config      = $this->_config;
        $browserType = $this->getType();
        if (!isset($config[$browserType]) || !isset($config[$browserType]['features'])) {
            return array();
        }
        $config = $config[$browserType]['features'];

        if (empty($config['classname'])) {
            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)) {
                

    public function setOptions($options)
    {
        if ($options instanceof Zend_Config) {
            $options = $options->toArray();
        }

        if (!is_array($options)
            && !$options instanceof ArrayAccess
            && !$options instanceof Traversable
        ) {
            throw new Zend_Http_UserAgent_Exception(sprintf(
                'Invalid argument; expected array, Zend_Config object, or object implementing ArrayAccess and Traversable; received %s',
                (is_object($options) ? get_class($options) : gettype($options))
            ));
        }

        // Set $_SERVER first         if (isset($options['server'])) {
            $this->setServer($options['server']);
            unset($options['server']);
        }