(PECL mongo >=0.9.6)
MongoCursor::dead — Checks if there are results that have not yet been sent from the database
The database sends responses in batches of documents, up to 4MB of documents per response. This method checks if the database has more batches or if the result set has been exhausted.
   A cursor being "dead" does not mean that 
   MongoCursor::hasNext() will return FALSE, it only means
   that the database is done sending results to the client. The client should
   continue iterating through results until 
   MongoCursor::hasNext() is FALSE.
  
This function has no parameters.
   Returns TRUE if there are more results that have not yet been sent to the
   client, and FALSE otherwise.