code: public function removeSheetByIndex($pIndex)
      {
          $numSheets = count($this->workSheetCollection);
          if ($pIndex > $numSheets - 1) {
              throw new Exception(
                  "You tried to remove a sheet by the out of bounds index: {$pIndex}. The actual number of sheets is {$numSheets}."
              );
          }
          array_splice($this->workSheetCollection, $pIndex, 1);
  
          // Adjust active sheet index if necessary
          if (($this->activeSheetIndex >= $pIndex) &&
              ($pIndex > count($this->workSheetCollection) - 1)) {
              --$this->activeSheetIndex;
          }
      }
docs: Remove sheet by index.
  
  @param int $pIndex Active sheet index
  
  @throws Exception