class Offers_View extends Zend_View
{

    public function __call($name, $args)
    {
        $helper = $this->getHelper($name);
        if ($helper instanceof Offers_View_Helper) {
            return $helper->run($name, $args);
        } else {
            return parent::__call($name, $args);
        }
    }
}

class Offers_View_Helper extends Zend_View_Helper_Abstract
{
    public function run($name, $args)
    {
        $output = call_user_func_array(array($this, $name), $args);
        //do caching things
        return $output;
    }
}