How to use variables in Twig filter 'replace'

Question

Handing over an array from php of form

$repl_arr = array('serach-string1' => 'replace1', ...) 

to a Twig template I would like to replace strings in a Twig variable per replace filter similar to this:

{{ block | replace({ repl_arr }) }}

That does not function and neither a variable loop like

{% for key,item in repla_arr %}
  {% set var = block | replace({ key : item }) %}
{% endfor %}

does. What is wrong with it? How could it work?

Answer 1

Either you pass the whole array, or you loop the replaces.

But when looping the replaces you need to wrap key and value in parentheses to force interpolation of those

{% set replaces = {
    '{site}'     : '{stackoverflow}',
    '{date}'  : "NOW"|date('d-m-Y'),
} %}

{% set haystack = '{site} foobar {site} {date} bar' %}


{{ haystack | replace(replaces) }}

{% set output = haystack %}
{% for key, value in replaces %}
    {% set output = output|replace({(key) : (value),}) %}
{% endfor %} 
{{ output }}

fiddle