Twig loop gets mutliplied - symfony

Question

Lets say I have some data called 'brands ' in an array past into a twig template like this:
{ 0:1,1:2,2:3,3:4,4:5,5:6,6:7,7:8}
Second array called 'designs' like this
{120:11,123:22,189:32,300:34,400:53,500:63,688:37,799:28}
o/p excepted
12,24,35,38,59,70,45,36
the below code shows what i have tried and the o/p expected for 8 times, but i am getting 64 times the output like
{% for key ,value in brands %}
{% for key,design in designs %}
// for example i need to add the value and design for 8 times
{% set total = value + design %}
{% endfor %}
{% endfor %}

Answer 1

You are incorrectly nesting your loops, and adding each element of designs to each element of brands. You only need one loop:
{% for key, value in brands %}
{% set total = value + designs[key] %}
{% endfor %}
Don't forget you can't access total unless you define it before starting the loop:
{% set total = 0 %}
{% for key, value in brands %}
{% set total = value + designs[key] %}
{% endfor %}
If you're looking for the sum of both of the arrays into one total with varying numbers of elements for brands and designs:
{% set total = 0 %}
{% for key, value in brands %}
{% set total = total + value %}
{% endfor %}
{% for key, value in designs %}
{% set total = total + value %}
{% endfor %}
If you're looking to add together each corresponding element between designs and brands without depending on matching keys - it's a much more difficult process when trying to do it in Twig, and you're missing what Twig is meant for entirely. You should handle this data in the controller or build a better data model to pass to Twig. For example:
$brands = array(0=>1,1=>2,2=>3,3=>4,4=>5,5=>6,6=>7,7=>8);
$designs = array(120=>11,123=>22,189=>32,300=>34,400=>53,500=>63,688=>37,799=>28);
$brands_designs = array();
foreach ($brands as $key => $brand) {
$design_key = key($designs);
$brands_designs[$key] = array(
'brand' => $brand,
'brand_key' => $key,
'design' => next($designs),
'design_key' => $design_key
);
}
return $this->render('AcmeBundle:Folder:template.html.twig', array('brands_designs' => $brands_designs));
Then in your Twig template:
{% for key, value in brands_designs %}
{% set total = value.brand + value.design %}
{% endfor %}
But if you insist on matching each element together and adding them individually...
{% for brandKey, brand in brands %}
{% set outerLoopIndex = loop.index %}
{% for designKey, design in designs %}
{% if outerLoopIndex == loop.index %}
{% set total = brand + design %}
{# do stuff with total here, like {{ total }} #}
{% endif %}
{% endfor %}
{% endfor %}
The above isn't tested, I'm a little worried about variable scope in there. It actually iterates a total of 64 times with your sample set but only outputs on the diagonal (when the outer index == inner index, so 1 == 1, 2 == 2, etc.)