Using three variables at same time to specify value in array with Twig

Question

I have two arrays: teachers_number_array which contains the id of teachs and the another array 'teachers' witch contains the data of each teacher.

What I can't do is to show the name of a specific teacher based on its id:

{% for teachers_number in teachers_number_array %}
    {% if teachers_number in teachers|keys %}
        {{ teachers.teachers_number.name }} 
    {% endif %}
{% endfor %}

Answer 1

You can do something like this. Note that you can get the key of the array directly in the Twig loop (for id, teacher in teachers):

PHP variables:

$teachers_to_display = [2, 3];
$teachers =  [
    1 => 'Fabien',
    2 => 'COil',
    3 => 'Tokeeen',
    'do not display' => 'Nooooo',
];

Twig:

{% for id, teacher in teachers %}
    {% if id in teachers_to_display %}
        {{ teacher }}
    {% endif %}
{% endfor %}

Will output:

• COil
• Tokeeen

PS: If you have several properties just use teacher.name like you did before:

$teachers =  [
    1 => [
        'name' => 'Pot',
        'firstname' => 'Fabien',
...