Query (find many) documents from multiple collections with the same document structure (MongoDB & PHP)

I use MongoDB PHP v1.3 and in my MongoDB I have multiple collections:

// COLLECTION NAMES:
- user_1_list_1
- user_1_list_2
- user_1_list_3
...
- user_1_list_55

All these collection have the same document-structure:

{
   first_name
   last_name
   phone
}

How can I query the documents from all of these collections at the same time? In the documentation it is explained how to query (find many) documents from one collection: https://docs.mongodb.com/php-library/v1.3/tutorial/crud/#find-many-documents.

For example, in my case, it would look something like this:

$collection_name = "user_1_list_1";
$collection = $this->db->{$collection_name};

$query = []; 

$cursor = $collection->find(
    $query,
    [
        'limit' => 10,
        'skip'  => 0,
        'sort'  => ['first_name' => 1],
    ]
);

... but this will find documents only from one collection (in this case, only from collection with name "user_1_list_1").

How to find documents from all of these collections (user_1_list_1, user_1_list_2, user_1_list_3 ... ) (that have the same structure), not just from one specific? Is this possible at all? If yes, how would you do that?

from Query (find many) documents from multiple collections with the same document structure (MongoDB & PHP)