New in version 1.7: The iterable test was added in Twig 1.7.
iterable
checks if a variable is an array or a traversable object:
{# 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 %}
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http://twig.sensiolabs.org/doc/1.x/tests/iterable.html