code: public function getColumnDimension($pColumn, $create = true)
      {
          // Uppercase coordinate
          $pColumn = strtoupper($pColumn);
  
          // Fetch dimensions
          if (!isset($this->columnDimensions[$pColumn])) {
              if (!$create) {
                  return null;
              }
              $this->columnDimensions[$pColumn] = new ColumnDimension($pColumn);
  
              if (Coordinate::columnIndexFromString($this->cachedHighestColumn) < Coordinate::columnIndexFromString($pColumn)) {
                  $this->cachedHighestColumn = $pColumn;
              }
          }
  
          return $this->columnDimensions[$pColumn];
      }
docs: Get column dimension at a specific column.
  
  @param string $pColumn String index of the column eg: 'A'
  @param bool $create
  
  @return ColumnDimension