Example of using macros in Twig

common.twig

{% macro valueOrDefault(value, default, attribute) %}
    {% if value %}
        {{ attribute ? attribute(value, attribute) : value }}
    {% else %}
        {{ default }}
    {% endif %}
{% endmacro %}

{% macro optionalValue(value, attribute) %}
    {% import _self as self %}

    {% set default %}
        <span class="empty">empty</span>
    {% endset %}

    {{ self.valueOrDefault(value, default, attribute) }}
{% endmacro %}

{% macro requiredValue(value, attribute) %}
    {% import _self as self %}

    {% set default %}
        <span class="label label-important">required</span>
    {% endset %}

    {{ self.valueOrDefault(value, default, attribute) }}
{% endmacro %}

output.html

<!--   
    class Team {
        public name;
    }
    
    class User {
        public email;
        public phone;
        /** @var Team|null */
        public team;
    }
    
    $user = new User();
    $user->phone = '721123456';
-->

<table>
    <tr>
        <th>E-mail</th>
        <td>
            <span class="label label-important">required</span>
        </td>
    </tr>
    <tr>
        <th>Phone</th>
        <td>721123456</td>
    </tr>
    <tr>
        <th>Team</th>
        <td>
            <span class="empty">empty</span>
        </td>
    </tr>
</table>

template.twig

{% import "common.twig" as common %}

<table>
    <tr>
        <th>E-mail</th>
        <td>{{ common.requiredValue(user.email) }}</td>
    </tr>
    <tr>
        <th>Phone</th>
        <td>{{ common.optionalValue(user.phone) }}</td>
    </tr>
    <tr>
        <th>Team</th>
        <td>
            {{ common.optionalValue(user.team, 'name') }}
        </td>
    </tr>
</table>