A gist for pagination in Twig, based on the total number of pages, the current page and some URL-settings. Modified to work with bootstrap 4.

pagination.html.twig

{#
  Source: (removed because website is dead, is spam)
  Updated by: ArdentSword
  Modified to work with symfony/bootstrap and have default values for some of the arguments
  
  Tested with Symfony 3.2/3.3/3.4 and Bootstrap 4 alpha/beta/release

  Parameters:
    * currentPage (int) : the current page you are in
    * lastPage (int) : represents the total number of existing pages
    * [currentFilters (array) = current route params] : associative array that contains the current route-arguments
    * [paginationPath (string) = current route] : the route name to use for links
    * [showAlwaysFirstAndLast (bool) = true] : Always show first and last link (just disabled)
#}
{% spaceless %}
    {% if lastPage > 1 %}

        {# the number of first and last pages to be displayed #}
        {% set extremePagesLimit = 3 %}

        {# the number of pages that are displayed around the active page #}
        {% set nearbyPagesLimit = 2 %}

        {% if currentFilters is not defined %}{% set currentFilters = app.request.attributes.get('_route_params') %}{% endif %}
        {% if paginationPath is not defined %}{% set paginationPath = app.request.attributes.get('_route') %}{% endif %}
        {% if showAlwaysFirstAndLast is not defined %}{% set showAlwaysFirstAndLast = true %}{% endif %}

        <nav aria-label="Page navigation example">
        <ul class="pagination">
            {% if currentPage > 1 %}
                <li class="page-item"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({page: currentPage-1})) }}">Previous</a></li>

                {% for i in range(1, extremePagesLimit) if ( i < currentPage - nearbyPagesLimit ) %}
                    <li class="page-item"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({page: i})) }}">{{ i }}</a></li>
                {% endfor %}

                {% if extremePagesLimit + 1 < currentPage - nearbyPagesLimit %}
                    <span class="sep-dots">...</span>
                {% endif %}

                {% for i in range(currentPage-nearbyPagesLimit, currentPage-1) if ( i > 0 ) %}
                    <li class="page-item"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({page: i})) }}">{{ i }}</a></li>
                {% endfor %}
            {% elseif showAlwaysFirstAndLast %}
                <li class="page-item disabled"><a class="page-link" href="#">Previous</a></li>
            {% endif %}

            <li class="page-item active"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({ page: currentPage })) }}">{{ currentPage }}</a></li>

            {% if currentPage < lastPage %}
                {% for i in range(currentPage+1, currentPage + nearbyPagesLimit) if ( i <= lastPage ) %}
                    <li class="page-item"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({page: i})) }}">{{ i }}</a></li>
                {% endfor %}

                {% if  (lastPage - extremePagesLimit) > (currentPage + nearbyPagesLimit) %}
                    <span class="sep-dots">...</span>
                {% endif %}

                {% for i in range(lastPage - extremePagesLimit+1, lastPage) if ( i > currentPage + nearbyPagesLimit ) %}
                    <li class="page-item"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({page: i})) }}">{{ i }}</a></li>
                {% endfor %}

                <li class="page-item"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({page: currentPage+1})) }}">Next</a></li>
            {% elseif showAlwaysFirstAndLast %}
                <li class="page-item disabled"><a class="page-link" href="#">Next</a></li>
            {% endif %}
        </ul>
        </nav>
    {% endif %}
{% endspaceless %}