public function setLoggingMode($mode, $filename = NULL) {
		$this->logging_mode = $mode;
		$this->log_filename = $filename;
	}
public function setLoggingMode($mode, $filename = NULL) {
		$this->logging_mode = $mode;
		$this->log_filename = $filename;
	}
public function setLoggingMode ( $ mode , $ filename = NULL ) { $ this -> logging_mode = $ mode ; $ this -> log_filename = $ filename ; }
Set logging mode
@param int logging mode
@param string filename (only if $mode = 2)
Set logging mode