Zend FR

require_once 'Zend/Layout.php';

class Mmx_Layout extends Zend_Layout
{
    protected $_subLayout;
    protected $_modulesPath;

    public function setSubLayout($subLayout)
    {
        $this->_subLayout = $subLayout;
    }

    public function getSubLayout()
    {
        return $this->_subLayout;
    }

    public function setModulesPath($modulesPath)
    {
        $this->_modulesPath = $modulesPath;
    }

    public function getModulesPath()
    {
        return $this->_modulesPath;
    }

    /**
     * Static method for initialization with MVC support
     *
     * @param  string|array|Zend_Config $options
     * @return Zend_Layout
     */
    public static function startMvc($options = null)
    {
        if (null === self::$_mvcInstance) {
            self::$_mvcInstance = new self($options, true);
        } else {
            self::$_mvcInstance->setOptions($options);
        }

        return self::$_mvcInstance;
    }

    /** Render layout
     *
     * Sets internal script path as last path on script path stack, assigns
     * layout variables to view, determines layout name using inflector, and
     * renders layout view script.
     *
     * $name will be passed to the inflector as the key 'script'.
     *
     * @param  mixed $name
     * @return mixed
     */
     
    public function render($name = null, $subLayout = null)
    {
        if (null === $name) {
            $name = $this->getLayout();
        }
        if (null === $subLayout) {
            $subLayout = $this->getSubLayout();
        }

        if ($this->inflectorEnabled() && (null !== ($inflector = $this->getInflector())))
        {
            $name = $this->_inflector->filter(array('script' => $name));
            $subLayout = $this->_inflector->filter(array('script' => $subLayout));
        }

        $view = $this->getView();

        if (null !== ($path = $this->getLayoutPath())) {
            $view->addScriptPath($path);
        }
        
        // sublayout is stored in the page
        $content = array();
        $content['subLayoutContent'] = $view->render($subLayout);
        $this->assign($content);

        
        return $view->render($name);
    }


}




class Mmx_Layout_Controller_Action_Helper_Layout  extends Zend_Layout_Controller_Action_Helper_Layout
{
    /**
     * Constructor
     * 
     * @param  Zend_Layout $layout 
     * @return void
     */
    public function __construct(Mmx_Layout $layout = null)
    {
        if (null !== $layout) {
            $this->setLayoutInstance($layout);
        } else {
            $layout = Mmx_Layout::getMvcInstance();
        }
        
        if (null !== $layout) {
            $pluginClass = $layout->getPluginClass();
            $front = $this->getFrontController();
            if ($front->hasPlugin($pluginClass)) {
                $plugin = $front->getPlugin($pluginClass);
                $plugin->setLayoutActionHelper($this);
            }
        }
    }
    
    /**
     * Get layout object
     * 
     * @return Zend_Layout
     */
    public function getLayoutInstance()
    {
        if (null === $this->_layout) {
            require_once 'Mmx/Layout.php';
            if (null === ($this->_layout = Mmx_Layout::getMvcInstance())) {
                $this->_layout = new Mmx_Layout();
            }
        }

        return $this->_layout;
    }
}


class Mmx_View_Helper_Layout
{
    /** @var Mmx_Layout */
    protected $_layout;

    /** Zend_View_Interface */
    public $view;

    /**
     * Set view
     * 
     * @param  Zend_View_Interface $view 
     * @return void
     */
    public function setView(Zend_View_Interface $view)
    {
        $this->view = $view;
    }

    /**
     * Get layout object
     * 
     * @return Mmx_Layout
     */
    public function getLayout()
    {
        if (null === $this->_layout) {
            require_once 'Mmx/Layout.php';           
            $this->_layout = Mmx_Layout::getMvcInstance();
            if (null === $this->_layout) {                         
                // Implicitly creates layout object
                $this->_layout = new Mmx_Layout();
            }
        }

        return $this->_layout;
    }

    /**
     * Set layout object
     * 
     * @param  Mmx_Layout $layout 
     * @return Mmx_Layout_Controller_Action_Helper_Layout
     */
    public function setLayout(Mmx_Layout $layout)
    {
        $this->_layout = $layout;
        return $this;
    }

    /**
     * Return layout object
     *
     * Usage: $this->layout()->setLayout('alternate');
     * 
     * @return Mmx_Layout
     */
    public function layout()
    {
        return $this->getLayout();
    }
}

echo $this->layout()->content;

$this->layout()->setSubLayout('2column.phtml');

Fatal error: Uncaught exception 'Zend_Filter_Exception' with message 'A replacement identifier : was found inside the inflected target, perhaps a rule was not satisfied with a target source? Unsatisfied inflected target: :script.phtml' in D:\Dev\Vivalur\application\lib\Zend\Filter\Inflector.php:455 Stack trace: #0 D:\Dev\Vivalur\application\lib\Viv\Layout.php(30): Zend_Filter_Inflector->filter(Array) #1 D:\Dev\Vivalur\application\lib\Zend\Layout\Controller\Plugin\Layout.php(142): Viv_Layout->render() #2 D:\Dev\Vivalur\application\lib\Zend\Controller\Plugin\Broker.php(337): Zend_Layout_Controller_Plugin_Layout->postDispatch(Object(Viv_Controller_Request_Http)) #3 D:\Dev\Vivalur\application\lib\Zend\Controller\Front.php(925): Zend_Controller_Plugin_Broker->postDispatch(Object(Viv_Controller_Request_Http)) #4 D:\Dev\Vivalur\application\lib\Viv\Controller\Front.php(73): Zend_Controller_Front->dispatch(Object(Viv_Controller_Request_Http), NULL) #5 D:\Dev\Vivalur\html\index.php(22): Viv_Controller_Front->dispatch() #6 {main} in D:\Dev\Vivalur\application\lib\Zend\Filter\Inflector.php on line 455