how to get array of objects in object itself in php through json

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I am developing on-line property booking site for tourist here is my table as where i am retriving data from database as

PROPERTYiD ACCOMODATIONTYPE AVAILABLEROOMS
-----------------------------------------------
| |
kalyan appartment | 1BHK | 5
kalyan appartment | 2 BHK | 6

BHARAT tourist | VILLA | 2
BHARAT tourist | 2 BHK | 3
sneh tourist hotel | 2hk room | 1

My json is

{"rows":[{"propertyId":"kalyan appartment","cell":[{"available_rooms":"5","AccomodationTypeName":"1bhk"}]},{"propertyId":"kalyan appartment","cell":[{"available_rooms":"6","AccomodationTypeName":"2bhk"}]},{"propertyId":"BHARAT tourist","cell":[{"available_rooms":"2","AccomodationTypeName":"villa"}]},{"propertyId":"BHARAT tourist","cell":[{"available_rooms":"3","AccomodationTypeName":"2bhk"}]},{"propertyId":"sneh tourist hotel","cell":[{"available_rooms":"1","AccomodationTypeName":"2hk room"}]}]}

Here my json is displying available rooms per accommodation type but i want my json should be (no of accomodation & their available rooms per property id )means it should give json as-

{"rows":[{"propertyId":"kalyan appartment","cell":[{"AccomodationTypeName":"1bhk","available_rooms":"5"},{"Acco‌​modationTypeName":"2bhk","available_rooms":"6"}]},{"propertyId":"BHARAT tourist","cell":[{"AccomodationTypeName":"VILLA","available_rooms":"2"},{"Accomo‌​dationTypeName":"2bhk","available_rooms":"3"}]},{"propertyId":"sneh tourist hotel","cell":[{"AccomodationTypeName":"2hk room","available_rooms":"1"}]}]}