PHP : Push an object in deep nested array

Hello,
thank your for answering me.

I can’t make your code work.

I can’t select directly the nested ObjectID like you suggest :

['_id' => '67181338e074859fa50a7620']

I can only select it like that :

['comments.replies._id' => '67181338e074859fa50a7620']

But after that, I can’t find the right path to push my array in the “replies” key that match this objectID.