original_string: protected function startSheet()
      {
          $this->sheetFilePointer = fopen($this->worksheetFilePath, 'w');
          $this->throwIfSheetFilePointerIsNotAvailable();
  
          fwrite($this->sheetFilePointer, self::SHEET_XML_FILE_HEADER);
          fwrite($this->sheetFilePointer, '<sheetData>');
      }
code: protected function startSheet()
      {
          $this->sheetFilePointer = fopen($this->worksheetFilePath, 'w');
          $this->throwIfSheetFilePointerIsNotAvailable();
  
          fwrite($this->sheetFilePointer, self::SHEET_XML_FILE_HEADER);
          fwrite($this->sheetFilePointer, '<sheetData>');
      }
code_tokens: protected function startSheet ( ) { $ this -> sheetFilePointer = fopen ( $ this -> worksheetFilePath , 'w' ) ; $ this -> throwIfSheetFilePointerIsNotAvailable ( ) ; fwrite ( $ this -> sheetFilePointer , self :: SHEET_XML_FILE_HEADER ) ; fwrite ( $ this -> sheetFilePointer , '<sheetData>' ) ; }
docstring: Prepares the worksheet to accept data
  
  @return void
  @throws \Box\Spout\Common\Exception\IOException If the sheet data file cannot be opened for writing
docstring_tokens: Prepares the worksheet to accept data