Builder.php

<?php

namespace Linkofy\CommonBundle\Menu;

use Knp\Menu\FactoryInterface;
use Symfony\Component\DependencyInjection\ContainerAware;

class Builder extends ContainerAware
{
    public function mainMenu(FactoryInterface $factory, array $options)
    {
        $menu = $factory->createItem('root');
        $menu->setChildrenAttribute('class', 'nav pull-right');

        $menu->addChild('User')
             ->setAttribute('dropdown', true);

        $menu['User']->addChild('Profile', array('uri' => '#'))
                     ->setAttribute('divider_append', true);
        $menu['User']->addChild('Logout', array('uri' => '#'));

        $menu->addChild('Language')
             ->setAttribute('dropdown', true)
             ->setAttribute('divider_prepend', true);

        $menu['Language']->addChild('Deutsch', array('uri' => '#'));
        $menu['Language']->addChild('English', array('uri' => '#'));

        return $menu;
    }
}

example.png

knp_menu.html.twig

{% extends 'knp_menu.html.twig' %}

{% block item %}
{% import "knp_menu.html.twig" as macros %}
{% if item.displayed %}
    {%- set attributes = item.attributes %}
    {%- set is_dropdown = attributes.dropdown|default(false) %}
    {%- set divider_prepend = attributes.divider_prepend|default(false) %}
    {%- set divider_append = attributes.divider_append|default(false) %}

{# unset bootstrap specific attributes #}
    {%- set attributes = attributes|merge({'dropdown': null, 'divider_prepend': null, 'divider_append': null }) %}

    {%- if divider_prepend %}
        {{ block('dividerElement') }}
    {%- endif %}

{# building the class of the item #}
    {%- set classes = item.attribute('class') is not empty ? [item.attribute('class')] : [] %}
    {%- if item.current %}
        {%- set classes = classes|merge([options.currentClass]) %}
    {%- elseif item.currentAncestor %}
        {%- set classes = classes|merge([options.ancestorClass]) %}
    {%- endif %}
    {%- if item.actsLikeFirst %}
        {%- set classes = classes|merge([options.firstClass]) %}
    {%- endif %}
    {%- if item.actsLikeLast %}
        {%- set classes = classes|merge([options.lastClass]) %}
    {%- endif %}

{# building the class of the children #}
    {%- set childrenClasses = item.childrenAttribute('class') is not empty ? [item.childrenAttribute('class')] : [] %}
    {%- set childrenClasses = childrenClasses|merge(['menu_level_' ~ item.level]) %}

{# adding classes for dropdown #}
    {%- if is_dropdown %}
        {%- set classes = classes|merge(['dropdown']) %}
        {%- set childrenClasses = childrenClasses|merge(['dropdown-menu']) %}
    {%- endif %}

{# putting classes together #}
    {%- if classes is not empty %}
        {%- set attributes = attributes|merge({'class': classes|join(' ')}) %}
    {%- endif %}
    {%- set listAttributes = item.childrenAttributes|merge({'class': childrenClasses|join(' ') }) %}

{# displaying the item #}
    <li{{ macros.attributes(attributes) }}>
        {%- if is_dropdown %}
            {{ block('dropdownElement') }}
        {%- elseif item.uri is not empty and (not item.current or options.currentAsLink) %}
            {{ block('linkElement') }}
        {%- else %}
            {{ block('spanElement') }}
        {%- endif %}
{# render the list of children#}
        {{ block('list') }}
    </li>
    
    {%- if divider_append %}
        {{ block('dividerElement') }}
    {%- endif %}
{% endif %}
{% endblock %}

{% block dividerElement %}
{% if item.level == 1 %}
    <li class="divider-vertical"></li>
{% else %}
    <li class="divider"></li>
{% endif %}
{% endblock %}

{% block dropdownElement %}
    {%- set classes = item.linkAttribute('class') is not empty ? [item.linkAttribute('class')] : [] %}
    {%- set classes = classes|merge(['dropdown-toggle']) %}
    {%- set attributes = item.linkAttributes %}
    {%- set attributes = attributes|merge({'class': classes|join(' ')}) %}
    {%- set attributes = attributes|merge({'data-toggle': 'dropdown'}) %}
    <a href="#"{{ macros.attributes(attributes) }}>{{ block('label') }} <b class="caret"></b></a>
{% endblock %}

{% block label %}{{ item.label|trans }}{% endblock %}

layout.html.twig

{{ knp_menu_render('LinkofyCommonBundle:Builder:mainMenu', {'currentClass': 'active'}) }}