function undo() {
		if ($this->flag) {
			if ($this->count)
				$this->count--;
			return $this->restore($this->count);
		}
		return $this;
	}
function undo() {
		if ($this->flag) {
			if ($this->count)
				$this->count--;
			return $this->restore($this->count);
		}
		return $this;
	}
function undo ( ) { if ( $ this -> flag ) { if ( $ this -> count ) $ this -> count -- ; return $ this -> restore ( $ this -> count ) ; } return $ this ; }
Undo most recently applied filter
@return object
Undo most recently applied filter