code: public function getRow($int = 0)
      {
          if (!isset($this->arr[$int])) {
              throw new \OutOfRangeException('There is no line having this index.');
          }
  
          return $this->arr[$int];
      }
docs: Gets the row having the given index.
  
  @throw \OutOfRangeException If given index does not exist.
  @param  integer $int Row's index
  @access public
  @return mixed