slice¶

New in version 1.6: The slice filter was added in Twig 1.6.

The slice filter extracts a slice of a sequence, a mapping, or a string:

{% for i in [1, 2, 3, 4]|slice(1, 2) %}
    {# will iterate over 2 and 3 #}
{% endfor %}

{{ '1234'|slice(1, 2) }}

{# outputs 23 #}

You can use any valid expression for both the start and the length:

{% for i in [1, 2, 3, 4]|slice(start, length) %}
    {# ... #}
{% endfor %}

As syntactic sugar, you can also use the [] notation:

{% for i in [1, 2, 3, 4][start:length] %}
    {# ... #}
{% endfor %}

{{ '1234'[1:2] }}

The slice filter works as the array_slice PHP function for arrays and substr for strings.

If the start is non-negative, the sequence will start at that start in the variable. If start is negative, the sequence will start that far from the end of the variable.

If length is given and is positive, then the sequence will have up to that many elements in it. If the variable is shorter than the length, then only the available variable elements will be present. If length is given and is negative then the sequence will stop that many elements from the end of the variable. If it is omitted, then the sequence will have everything from offset up until the end of the variable.