How do you reference an Empty set ({}) valued field in mongodb through php? -

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this question has answer here:

i have following code works fine in mongodb client:-

 db.whatevercollection.update({id:999999,external_ids:{}},     {$unset: { "external_ids": true}})

how reference empty set in php external_ids field removed? using this:-

array('id' =>  $id,'external_ids'=>array())

doesn't work...





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