home.html.twig

{% block body %}
    <h1>Сортировка массива:</h1>
    <form method="POST">
        {{ dump(array) }}
        {% for key1, value1 in array %}
            {% for key2, value2 in value1 %}
                <input type="hidden" name="array[][]" value="{{ value2 }}">
            {% endfor %}
        {% endfor %}
        <button type="submit">Отправить массив</button>
    </form>
{% endblock %}