(PECL mongo >=1.2.0) Set the size for future connection pools.

(PECL mongo >=0.9.0) Return the next file to which this cursor points, and advance the cursor

(PECL mongo >= 1.3.0) Gets the previously set callback function

(PECL mongo >=0.9.0) Returns the current file

(PECL mongo >=1.6.0) Set the read preference for this query

(PECL mongo >=0.9.2) Stores a string of bytes in the database