Simple Bootstrap Alert Slim/Twig Macro

app.php

/**
 *  Using PHP Slim Frameworks slim/flash
 *  https://www.slimframework.com/docs/features/flash.html
 *
 *  Assuming this is called from within a Slim route $app->get()
 */

$this->flash->addMessage('success', 'Some success message');

index.phtml

{# Usage of the Bootstrap Alert Twig Macro in a Template #}

{% import "notices.phtml" as notices %}

{{notices.bootstrap_alert(messages)}}

notices.phtml

{# notices.phtml #}

{% macro bootstrap_alert(messages) %}
    {% if messages %}
        {% for notice_level, notices in messages %}
            <div class="alert alert-{{ notice_level }}">
                <a class="close" data-dismiss="alert" href="#">x</a>
                {% for notice in notices %}
                    <p>{{ notice }}</p>
                {% endfor %}
            </div>
        {% endfor %}
    {% endif %}
{% endmacro %}