iterable

iterable 检查变量是数组还是可遍历对象：

1
2
3
4
5
6
7
8
9
{# 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 %}