code: public function read($row, $column = null)
      {
          if (!$column) {
              return $this->sheet()[$row];
          }
  
          // skip header and convert column index to column name
          if ($row !== $this->firstRow()) {
              $column = $this->columns()[$column];
          }
  
          //\Zend\Debug\Debug::dump([$row, $column, $this->sheet()[$row][$column]]);
          return $this->sheet()[$row][$column];
      }
docs: {@inheritDoc}