How to use Twig block content twice in PHP?

Question

PHP

Is it possible to use the contents of a Twig block twice in PHP?
If you do this:

<title>{% block title %}{% endblock %}</title>
<h1>{% block title %}{% endblock %}</h1>

Gives an error message:

Fatal error: Uncaught exception 'Twig_Error_Syntax' with message 'The block 'title' has already been defined line 7 in "base.layout" at line 58'

Answer 1

<title>{% block title %}{% endblock %}</title>
<h1>{{ block('title') }}</h1>