"twig variable is defined" Code Answer's
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if variable is defined twig
{# defined works with variable names #}
{% if foo is defined %}
...
{% endif %}
{# and attributes on variables names #}
{% if foo.bar is defined %}
...
{% endif %}
{% if foo['bar'] is defined %}
...
{% endif %}
Source: twig.symfony.com
twig variable is defined
{% if varname is defined %}
Variable exists.
{% endif %}
twig variable is not defined
{% if not (varname is defined) %}
Variable does not exist.
{% endif %}
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