code: public function removeColumn($column)
      {
          foreach ($this->getCoordinates() as $coord) {
              sscanf($coord, '%[A-Z]%d', $c, $r);
              if ($c == $column) {
                  $this->delete($coord);
              }
          }
      }
docs: Remove a column, deleting all cells in that column.
  
  @param string $column Column ID to remove