1``reverse`` 2=========== 3 4The ``reverse`` filter reverses a sequence, a mapping, or a string: 5 6.. code-block:: twig 7 8 {% for user in users|reverse %} 9 ... 10 {% endfor %} 11 12 {{ '1234'|reverse }} 13 14 {# outputs 4321 #} 15 16.. tip:: 17 18 For sequences and mappings, numeric keys are not preserved. To reverse 19 them as well, pass ``true`` as an argument to the ``reverse`` filter: 20 21 .. code-block:: twig 22 23 {% for key, value in {1: "a", 2: "b", 3: "c"}|reverse %} 24 {{ key }}: {{ value }} 25 {%- endfor %} 26 27 {# output: 0: c 1: b 2: a #} 28 29 {% for key, value in {1: "a", 2: "b", 3: "c"}|reverse(true) %} 30 {{ key }}: {{ value }} 31 {%- endfor %} 32 33 {# output: 3: c 2: b 1: a #} 34 35.. note:: 36 37 It also works with objects implementing the `Traversable`_ interface. 38 39Arguments 40--------- 41 42* ``preserve_keys``: Preserve keys when reversing a mapping or a sequence. 43 44.. _`Traversable`: https://secure.php.net/Traversable 45