block#
When a template uses inheritance and if you want to print a block multiple
times, use the block function:
<title>{% block title %}{% endblock %}</title>
<h1>{{ block('title') }}</h1>
{% block body %}{% endblock %}
The block function can also be used to display one block from another
template:
{{ block("title", "common_blocks.twig") }}
Use the defined test to check if a block exists in the context of the
current template:
{% if block("footer") is defined %}
...
{% endif %}
{% if block("footer", "common_blocks.twig") is defined %}
...
{% endif %}