(PECL mongo >= 1.3.0) Sets a callback function to be invoked for events
(PECL mongo >= 1.2.3) Sets the module(s) to be logged
(PECL mongo >= 1.2.3) Gets the level(s) currently being logged
(PECL mongo >= 1.2.3) Gets the module(s) currently being logged
(PECL mongo >= 1.2.3) Sets the level(s) to be logged
(PECL mongo >= 1.3.0) Gets the previously set callback function