#``iterable`` > iterable 测试是Twig 1.7版本加入的。 ``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 %}