Setting element of array from Twig

Question

How can I set member of an already existing array from Twig?

I tried doing it next way:

{% set arr[\'element\'] = \'value\' %}

but

Answer 1

I've found this issue very annoying, and my solution is perhaps orthodox and not inline with the Twig philosophy, but I developed the following:

$function = new Twig_Function('set_element', function ($data, $key, $value) {
    // Assign value to $data[$key]
    if (!is_array($data)) {
        return $data;
    }
    $data[$key] = $value;
    return $data;
});
$twig->addFunction($function);

that can be used as follows:

{% set arr = set_element(arr, 'element', 'value') %}

Answer 2

There is no nice way to do this in Twig. It is, however, possible by using the merge filter:

{% set arr = arr|merge({'element': 'value'}) %}

Answer 3

I have tried @LivaX 's answer but it does not work , merging an array where keys are numeric wont work ( https://github.com/twigphp/Twig/issues/789 ).

That will work only when keys are strings

What I did is recreate another table ( temp) from the initial table (t) and make the keys a string , for example :

{% for key , value in t%}
{% set temp= temp|merge({(key~'_'):value}) %}
{% endfor %}

t keys : 0 , 1 , 2 ..

temp keys : 0_, 1_ , 2_ ....

Answer 4

You can also use the following syntax:

{% set myArray = myArray + myArray2 %}

Answer 5

{% set links = {} %}

{# Use our array to wrap up our links. #}
{% for item in items %}
  {% set links = links|merge({ (loop.index0) : {'url': item.content['#url'].getUri(), 'text': item.content['#title']} }) %}
{% endfor %}

{%
set linkList = {
  'title': label,
  'links': links
}
%}

{% include '<to twig file>/link-list.twig'%}

Thanks for this thread -- I was also able to create an array with (loop.index0) and send to twig.

Answer 6

I had a multi dimension array. The only solution I could find out is create a new temporary array and update/add the information, which was further passed on to another twig function.