(PECL mongo >=0.9.0)
MongoGridFSCursor::__construct — Create a new cursor
$gridfs
   , resource $connection
   , string $ns
   , array $query
   , array $fields
   )
gridfs
     Related GridFS collection.
connection
     Database connection.
ns
     Full name of database and collection.
query
     Database query.
fields
     Fields to return.
Returns the new cursor.