_defineFeatures example

public function __construct($userAgent = null, array $server = array(), array $config = array())
    {
        if (is_array($userAgent)) {
            // Restoring from serialized array             $this->_restoreFromArray($userAgent);
        } else {
            // Constructing new object             $this->setUserAgent($userAgent);
            $this->_server    = $server;
            $this->_config    = $config;
            $this->_getDefaultFeatures();
            $this->_defineFeatures();
        }
    }

    /** * Serialize object * * @return string */
    public function serialize()
    {
        $spec = array(
            

/** * Look for features * * @return string */
    protected function _defineFeatures()
    {
        $this->setFeature('images', false, 'product_capability');
        $this->setFeature('iframes', false, 'product_capability');
        $this->setFeature('frames', false, 'product_capability');
        $this->setFeature('javascript', false, 'product_capability');
        return parent::_defineFeatures();
    }
}

    /** * Look for features * * @return string */
    protected function _defineFeatures()
    {
        $this->setFeature('is_wireless_device', false, 'product_info');

        parent::_defineFeatures();

        if (isset($this->_aFeatures["mobile_browser"])) {
            $this->setFeature("browser_name", $this->_aFeatures["mobile_browser"]);
            $this->_browser = $this->_aFeatures["mobile_browser"];
        }
        if (isset($this->_aFeatures["mobile_browser_version"])) {
            $this->setFeature("browser_version", $this->_aFeatures["mobile_browser_version"]);
            $this->_browserVersion = $this->_aFeatures["mobile_browser_version"];
        }

        // markup

/** * Look for features * * @return string */
    protected function _defineFeatures()
    {
        $this->setFeature('iframes',    false, 'product_capability');
        $this->setFeature('frames',     false, 'product_capability');
        $this->setFeature('javascript', false, 'product_capability');
        return parent::_defineFeatures();
    }
}

/** * Look for features * * @return string */
    protected function _defineFeatures()
    {
        $this->setFeature('images', false, 'product_capability');
        $this->setFeature('iframes', false, 'product_capability');
        $this->setFeature('frames', false, 'product_capability');
        $this->setFeature('javascript', false, 'product_capability');
        return parent::_defineFeatures();
    }
}

/** * Look for features * * @return string */
    protected function _defineFeatures()
    {
        $this->setFeature('images', false, 'product_capability');
        $this->setFeature('iframes', false, 'product_capability');
        $this->setFeature('frames', false, 'product_capability');
        $this->setFeature('javascript', false, 'product_capability');
        return parent::_defineFeatures();
    }

    /** * Determine supported image formats * * @return null */
    public function getImageFormatSupport()
    {
        return null;
    }