Warning Twig version 1.x is no longer maintained.
iterable
1.7
The iterable test was added in Twig 1.7.
iterable checks if a variable is an array or a traversable object:
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{# evaluates to true if the foo variable is iterable #}
{% if users is iterable %}
{% for user in users %}
Hello {{ user }}!
{% endfor %}
{% else %}
{# users is probably a string #}
Hello {{ users }}!
{% endif %}