New in version 1.6: Support for strings has been added in Twig 1.6.
The reverse filter reverses a sequence, a mapping, or a string:
{% for user in users|reverse %}
...
{% endfor %}
{{ '1234'|reverse }}
{# outputs 4321 #}
Tip
For sequences and mappings, numeric keys are not preserved. To reverse them as well, pass true as an argument to the reverse filter:
{% for key, value in {1: "a", 2: "b", 3: "c"}|reverse %}
{{ key }}: {{ value }}
{%- endfor %}
{# output: 0: c 1: b 2: a #}
{% for key, value in {1: "a", 2: "b", 3: "c"}|reverse(true) %}
{{ key }}: {{ value }}
{%- endfor %}
{# output: 3: c 2: b 1: a #}
Note
It also works with objects implementing the Traversable interface.
preserve_keys: Preserve keys when reversing a mapping or a sequence.
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http://twig.sensiolabs.org/doc/1.x/filters/reverse.html