mongodb - Mongo DB, PHP add or update a field in a document -

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i have following document:

{    "_id": objectid("5241f1d79b7e7aed05000000"),    "description": {      "nl": "hallo",      "en": "hello"     },   "name": "marc" }

now need update update 1 existing field or add new field description. in php use update function mongo , following code:

$new_data = array(     '$set' => array(     "description" => array(          "de" => "hallo"        )     ) );

what removes other fields , insert "de" field. tried replacing $set $push (which thought made this) no result $setoninsert not anything.

how can solve problem can either add new field (if not exist) or update if exist.

thanks

just make update 

{$set: {"description.de": "hello"}}

i guess in code be:

$new_data = array(   '$set' => array(     "description.de" => "hallo"   ) );

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