Symfony: Index in collection Type - symfony

Question

I am trying to set the label of an embedded form type (collection type).
These labels have to be different for the different collections.
For example I have two collections and an array with the labels ['label1','label2'] in die form type.
I think I need the index of the collection iteration to get the right label.
Like below i need the index for the entry_options label to get the right value of the $labels array.
Thats my buildForm Method
public function buildForm(FormBuilderInterface $builder, array $options)
{
$labels = ['label1', 'label2'];
$builder
->add('otherForms', CollectionType::class, [
'entry_type' => otherFormType::class,
'entry_options' => ['label' => $labels[$index]],
])
...
;
}

Answer 1

After reading your comments, I must agree that translation bundles are sometimes heavy weight and quite inconvenient.
The CollectionType usually ignores the index/key of collection items given to it, though.
Now I see two scenarios: you want to give the labels as an option to your form or the form shall be dependent on the data (using form events). Your code so far suggests, that languages are set globally and will not be added on the fly in some other manner.
In the first scenario it's very simple (see below), the second scenario requires some event listener in your form, but apart from that, it's quite similar.
The essential idea is to just create the forms you need (optionally inside the pre-submit handler), since you apparently already know which forms you need from the label array:
foreach($labels as $index => $label) {
$builder->add('otherForms'.$index, otherFormType::class, [
'label' => $label,
'property_path' => 'otherForms['.$index.']',
]);
}
The use of property_path will help you access the proper elements (however, changing the language (= key) of a translation might be difficult, but that should not happen, usually. And even if it happens, only some copy-pasta is necessary).
Your otherForms keys probably will be differently, but I guess you'll figure it out.