How to retrieve all Variables from a Twig Template?

Question

Is it possible to retrieve all variables inside a Twig template with PHP?

Example someTemplate.twig.php:

Hello {{ name }}, 
your new email is {{ ema         


        

Answer 1

This is useful I find to get all the top-level keys available in the current context:

    {% for key, value in _context  %}
      
{{ key }}
    {% endfor %}

Thanks to https://www.drupal.org/node/1906780