public function offset($offset)
    {
        if(!empty($offset))
            $this->selectParams[self::OFFSET] = $offset;
        return $this;
    }
public function offset($offset)
    {
        if(!empty($offset))
            $this->selectParams[self::OFFSET] = $offset;
        return $this;
    }
public function offset ( $ offset ) { if ( ! empty ( $ offset ) ) $ this -> selectParams [ self :: OFFSET ] = $ offset ; return $ this ; }
Sets or clears the offset for the query.
If null is specified, the offset is cleared.

@param string $offset The offset to use. If NULL, the offset is cleared.

@return this
Sets or clears the offset for the query . If null is specified the offset is cleared .