Looping through an array to create a new array

03/03/2016 - SYMFONY, TWIG

Say for example an array variable is being sent to a twig template from a symfony application and it has duplicated values in it. In this example, it will be processed in twig template to create a new array variable without duplicated records.


Duplicated array


# This has been passed from symfony application
$cars = ['bmw', 'mercedes', 'audi', 'toyota', 'bmw', 'audi', 'mazda'];

# Print it in twig template
{{ dump(cars) }}

# Output in twig template
array:7 [
  0 => "bmw"
  1 => "mercedes"
  2 => "audi"
  3 => "toyota"
  4 => "bmw"
  5 => "audi"
  6 => "mazda"
]

Array reduce


{% set brands = [] %}
{% for car in cars %}
    {% if car not in brands %}
        {% set brands = brands|merge([car]) %}
    {% endif %}
{% endfor %}

{% for brand in brands %}
   {{ brand }}
{% endfor %}

Result


bmw mercedes audi toyota mazda