Zend Framework

/**
     * Whether only active branch should be rendered
     *
     * @var bool
     */
    protected $_expandBranch = false;

    /**
     * Sets a flag indicating whether the first depth and expand the active branch
     *
     * @param  bool $flag                        [optional] render the first depth and the active branch
     * 														. Default is true.
     * @return Zend_View_Helper_Navigation_Menu  fluent interface, returns self
     */
    public function setExpandBranch($flag = true)
    {
        $this->_expandBranch = (bool) $flag;
        return $this;
    }

    /**
     * Returns a flag indicating whether the first depth and the active branch should be rendered
     *
     * By default, this value is false, meaning the entire menu will be
     * be rendered.
     *
     * @return bool  whether only active branch should be rendered
     */
    public function getExpandBranch()
    {
        return $this->_expandBranch;
    }

    // Render methods:

    /**
     * Renders a normal menu (called from {@link renderMenu()})
     *
     * @param  Zend_Navigation_Container $container   container to render
     * @param  string                    $ulClass     CSS class for first UL
     * @param  string                    $indent      initial indentation
     * @param  int|null                  $minDepth    minimum depth
     * @param  int|null                  $maxDepth    maximum depth
     * @param  bool                      $onlyActive  render only active branch?
     * @param  bool                      $expandBranch  render sibling of the active branch
     * @return string
     */
    protected function _renderMenu(Zend_Navigation_Container $container,
                                   $ulClass,
                                   $indent,
                                   $minDepth,
                                   $maxDepth,
                                   $onlyActive,
                                   $expandBranch)
    {
        $html = '';

        // find deepest active
        if ($found = $this->findActive($container, $minDepth, $maxDepth)) {
            $foundPage = $found['page'];
            $foundDepth = $found['depth'];
        } else {
            $foundPage = null;
        }

        // create iterator
        $iterator = new RecursiveIteratorIterator($container,
                            RecursiveIteratorIterator::SELF_FIRST);
        if (is_int($maxDepth)) {
            $iterator->setMaxDepth($maxDepth);
        }

        // iterate container
        $prevDepth = -1;
        foreach ($iterator as $page) {
            $depth = $iterator->getDepth();
            $isActive = $page->isActive(true);
            if ($depth < $minDepth || !$this->accept($page)) {
                // page is below minDepth or not accepted by acl/visibilty
                continue;
            } else if ($expandBranch && $depth > $minDepth) { // If expand branch
            	// page is not active itself, but might be in the active branch
                $accept = false;
                if ($foundPage) {
                    if ($foundPage->hasPage($page)) {
                        // accept if page is a direct child of the active page
                        $accept = true;
                    } else if ($page->getParent()->isActive(true)) {
                        // page is a sibling of the active branch...
                        $accept = true;
                    }
                }  
            	if (!$isActive && !$accept) {
                    continue;
                }         
            } else if ($onlyActive && !$isActive) {
                // page is not active itself, but might be in the active branch
                $accept = false;
                if ($foundPage) {
                    if ($foundPage->hasPage($page)) {
                        // accept if page is a direct child of the active page
                        $accept = true;
                    } else if ($foundPage->getParent()->hasPage($page)) {
                        // page is a sibling of the active page...
                        if (!$foundPage->hasPages() ||
                            is_int($maxDepth) && $foundDepth + 1 > $maxDepth) {
                            // accept if active page has no children, or the
                            // children are too deep to be rendered
                            $accept = true;
                        }
                    }
                }

                if (!$accept) {
                    continue;
                }
            }

            // make sure indentation is correct
            $depth -= $minDepth;
            $myIndent = $indent . str_repeat('        ', $depth);

            if ($depth > $prevDepth) {
                // start new ul tag
                if ($ulClass && $depth ==  0) {
                    $ulClass = ' class="' . $ulClass . '"';
                } else {
                    $ulClass = '';
                }
                $html .= $myIndent . '<ul' . $ulClass . '>' . self::EOL;
            } else if ($prevDepth > $depth) {
                // close li/ul tags until we're at current depth
                for ($i = $prevDepth; $i > $depth; $i--) {
                    $ind = $indent . str_repeat('        ', $i);
                    $html .= $ind . '    </li>' . self::EOL;
                    $html .= $ind . '</ul>' . self::EOL;
                }
                // close previous li tag
                $html .= $myIndent . '    </li>' . self::EOL;
            } else {
                // close previous li tag
                $html .= $myIndent . '    </li>' . self::EOL;
            }

            // render li tag and page
            $liClass = $isActive ? ' class="active"' : '';
            $html .= $myIndent . '    <li' . $liClass . '>' . self::EOL
                   . $myIndent . '        ' . $this->htmlify($page) . self::EOL;

            // store as previous depth for next iteration
            $prevDepth = $depth;
        }

        if ($html) {
            // done iterating container; close open ul/li tags
            for ($i = $prevDepth+1; $i > 0; $i--) {
                $myIndent = $indent . str_repeat('        ', $i-1);
                $html .= $myIndent . '    </li>' . self::EOL
                       . $myIndent . '</ul>' . self::EOL;
            }
            $html = rtrim($html, self::EOL);
        }

        return $html;
    }

    /**
     * Renders helper
     *
     * Renders a HTML 'ul' for the given $container. If $container is not given,
     * the container registered in the helper will be used.
     *
     * Available $options:
     *
     *
     * @param  Zend_Navigation_Container $container  [optional] container to
     *                                               create menu from. Default
     *                                               is to use the container
     *                                               retrieved from
     *                                               {@link getContainer()}.
     * @param  array                     $options    [optional] options for
     *                                               controlling rendering
     * @return string                                rendered menu
     */
    public function renderMenu(Zend_Navigation_Container $container = null,
                               array $options = array())
    {
        if (null === $container) {
            $container = $this->getContainer();
        }

        $options = $this->_normalizeOptions($options);

        if ($options['onlyActiveBranch'] && !$options['renderParents']) {
            $html = $this->_renderDeepestMenu($container,
                                              $options['ulClass'],
                                              $options['indent'],
                                              $options['minDepth'],
                                              $options['maxDepth']);
        } else {
            $html = $this->_renderMenu($container,
                                       $options['ulClass'],
                                       $options['indent'],
                                       $options['minDepth'],
                                       $options['maxDepth'],
                                       $options['onlyActiveBranch'],
                                       $options['expandBranch']);
        }

        return $html;
    }

if ($expandBranch && $depth > $minDepth) { // If expand branch
            	// page is not active itself, but might be in the active branch
                $accept = false;
                if ($foundPage) {
                    if ($foundPage->hasPage($page)) {
                        // accept if page is a direct child of the active page
                        $accept = true;
                    } else if ($page->getParent()->isActive(true)) {
                        // page is a sibling of the active branch...
                        $accept = true;
                    }
                }  
            	if (!$isActive && !$accept) {
                    continue;
                }         
            }