Twig

Current year

{{ 'now'|date("Y") }}

GET and POST

For $_POST variables use this :
{{ app.request.parameter.get("page") }}

For $_GET variables use this :
{{ app.request.query.get("page") }}

For $_COOKIE variables use this :
{{ app.request.cookies.get("page") }}

For $_SESSION variables use this :
{{ app.request.session.get("page") }}

Link to the same page with parameters

{% set route_params = app.request.attributes.get('_route_params') %}

{# merge the query string params if you want to keep them when switching the locale #}
{% set route_params = route_params|merge(app.request.query.all) %}

{# merge the additional params you want to change #}
{% set route_params = route_params|merge({'_locale': 'fr'}) %}

{{ path(app.request.attributes.get('_route'), route_params) }} 

Recursive macro

{% import _self as macros %}

{% block content %}
  <ul class="mt-doc-list">
      {% for rubric in rubrics %}
          {{ macros.recursiveRubrics(rubric) }}
      {% endfor %}
  </ul>
{% endblock content %}

{% macro recursiveRubrics(rubric) %}
  <li>
      <a href="{{ rubric.path }}">{{ rubric.title }}</a>
      {% if rubric.children|length %}
          <ul>
              {% for child in rubric.children %}
                  {{ _self.recursiveRubrics(child) }}
              {% endfor %}
          </ul>
      {% endif %}
  </li>
{% endmacro %}