code: public function prev()
  	{
  		if ($this->intIndex < 1)
  		{
  			return false;
  		}
  
  		$this->blnDone = false;
  		$this->arrCache = $this->resultSet[--$this->intIndex];
  
  		return $this;
  	}
docs: Go to the previous row of the current result
  
  @return Result|boolean The result object or false if there is no previous row