# `length`

The `length` filter returns the number of items of a sequence or mapping, or the length of a string.

For objects that implement the `Countable` interface, `length` will use the return value of the `count()` method.

For objects that implement the `__toString()` magic method (and not `Countable`), it will return the length of the string provided by that method.

For objects that implement the `Traversable` interface, `length` will use the return value of the `iterator_count()` method.

For strings, mb_strlen() is used.

    {% if users|length > 10 %}
        ...
    {% endif %}