PhpOffice\PhpSpreadsheet\Writer\Xlsx\Worksheet

Complexity

Total Complexity

214

Size/Duplication

Total Lines	1198
Duplicated Lines	0 %

Test Coverage

Coverage

89.7%

Importance

Changes

0

23 Methods

Rating	Name	Duplication	Size	Complexity
A	writeDimension()	0	6	1
B	writeCols()	0	55	9
C	writeSheetPr()	0	38	8
D	writeSheetFormatPr()	0	43	9
D	writeSheetProtection()	0	26	18
B	writePageSetup()	0	26	5
A	writeMergeCells()	0	15	3
A	writeProtectedRanges()	0	19	4
F	writeSheetData()	0	76	16
F	writeCell()	0	108	29
B	writeHyperlinks()	0	31	5
A	writeLegacyDrawingHF()	0	7	2
A	writePrintOptions()	0	17	4
A	writeLegacyDrawing()	0	7	2
D	writeDataValidations()	0	57	16
A	writePageMargins()	0	11	1
B	writeHeaderFooter()	0	16	5
A	writeDrawings()	0	9	4
F	writeSheetViews()	0	101	16
B	writeWorksheet()	0	86	2
D	writeAutoFilter()	0	83	21
C	writeBreaks()	0	47	8
C	writeConditionalFormatting()	0	65	26

<?php

namespace PhpOffice\PhpSpreadsheet\Writer\Xlsx;

use PhpOffice\PhpSpreadsheet\Cell\Cell;
use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
use PhpOffice\PhpSpreadsheet\RichText\RichText;
use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
use PhpOffice\PhpSpreadsheet\Shared\XMLWriter;
use PhpOffice\PhpSpreadsheet\Style\Conditional;
use PhpOffice\PhpSpreadsheet\Worksheet\AutoFilter\Column;
use PhpOffice\PhpSpreadsheet\Worksheet\AutoFilter\Column\Rule;
use PhpOffice\PhpSpreadsheet\Worksheet\SheetView;
use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet as PhpspreadsheetWorksheet;
use PhpOffice\PhpSpreadsheet\Writer\Exception as WriterException;

/**
 * @category   PhpSpreadsheet
 *
 * @copyright  Copyright (c) 2006 - 2015 PhpSpreadsheet (https://github.com/PHPOffice/PhpSpreadsheet)
 */
class Worksheet extends WriterPart
{
    /**
     * Write worksheet to XML format.
     *
     * @param PhpspreadsheetWorksheet $pSheet
     * @param string[] $pStringTable
     * @param bool $includeCharts Flag indicating if we should write charts
     *
     * @throws WriterException
     *
     * @return string XML Output
     */
    public function writeWorksheet(PhpspreadsheetWorksheet $pSheet, $pStringTable = null, $includeCharts = false)
    {
        // Create XML writer
        $objWriter = null;
        if ($this->getParentWriter()->getUseDiskCaching()) {
            $objWriter = new XMLWriter(XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
        } else {
            $objWriter = new XMLWriter(XMLWriter::STORAGE_MEMORY);
        }

        // XML header
        $objWriter->startDocument('1.0', 'UTF-8', 'yes');

        // Worksheet
        $objWriter->startElement('worksheet');
        $objWriter->writeAttribute('xml:space', 'preserve');
        $objWriter->writeAttribute('xmlns', 'http://schemas.openxmlformats.org/spreadsheetml/2006/main');
        $objWriter->writeAttribute('xmlns:r', 'http://schemas.openxmlformats.org/officeDocument/2006/relationships');

        // sheetPr
        $this->writeSheetPr($objWriter, $pSheet);

        // Dimension
        $this->writeDimension($objWriter, $pSheet);

        // sheetViews
        $this->writeSheetViews($objWriter, $pSheet);

        // sheetFormatPr
        $this->writeSheetFormatPr($objWriter, $pSheet);

        // cols
        $this->writeCols($objWriter, $pSheet);

        // sheetData
        $this->writeSheetData($objWriter, $pSheet, $pStringTable);

It seems like $pStringTable can also be of type null; however, parameter $pStringTable of PhpOffice\PhpSpreadsheet\Writer\Xlsx\Worksheet::writeSheetData() does only seem to accept array, maybe add an additional type check?

        // sheetProtection
        $this->writeSheetProtection($objWriter, $pSheet);

        // protectedRanges
        $this->writeProtectedRanges($objWriter, $pSheet);

        // autoFilter
        $this->writeAutoFilter($objWriter, $pSheet);

        // mergeCells
        $this->writeMergeCells($objWriter, $pSheet);

        // conditionalFormatting
        $this->writeConditionalFormatting($objWriter, $pSheet);

        // dataValidations
        $this->writeDataValidations($objWriter, $pSheet);

        // hyperlinks
        $this->writeHyperlinks($objWriter, $pSheet);

        // Print options
        $this->writePrintOptions($objWriter, $pSheet);

        // Page margins
        $this->writePageMargins($objWriter, $pSheet);

        // Page setup
        $this->writePageSetup($objWriter, $pSheet);

        // Header / footer
        $this->writeHeaderFooter($objWriter, $pSheet);

        // Breaks
        $this->writeBreaks($objWriter, $pSheet);

        // Drawings and/or Charts
        $this->writeDrawings($objWriter, $pSheet, $includeCharts);

        // LegacyDrawing
        $this->writeLegacyDrawing($objWriter, $pSheet);

        // LegacyDrawingHF
        $this->writeLegacyDrawingHF($objWriter, $pSheet);

        $objWriter->endElement();

        // Return
        return $objWriter->getData();
    }

    /**
     * Write SheetPr.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeSheetPr(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // sheetPr
        $objWriter->startElement('sheetPr');
        if ($pSheet->getParent()->hasMacros()) {
            //if the workbook have macros, we need to have codeName for the sheet
            if ($pSheet->hasCodeName() == false) {

It seems like you are loosely comparing two booleans. Considering using the strict comparison === instead.

                $pSheet->setCodeName($pSheet->getTitle());
            }
            $objWriter->writeAttribute('codeName', $pSheet->getCodeName());
        }
        $autoFilterRange = $pSheet->getAutoFilter()->getRange();
        if (!empty($autoFilterRange)) {
            $objWriter->writeAttribute('filterMode', 1);
            $pSheet->getAutoFilter()->showHideRows();
        }

        // tabColor
        if ($pSheet->isTabColorSet()) {
            $objWriter->startElement('tabColor');
            $objWriter->writeAttribute('rgb', $pSheet->getTabColor()->getARGB());
            $objWriter->endElement();
        }

        // outlinePr
        $objWriter->startElement('outlinePr');
        $objWriter->writeAttribute('summaryBelow', ($pSheet->getShowSummaryBelow() ? '1' : '0'));
        $objWriter->writeAttribute('summaryRight', ($pSheet->getShowSummaryRight() ? '1' : '0'));
        $objWriter->endElement();

        // pageSetUpPr
        if ($pSheet->getPageSetup()->getFitToPage()) {
            $objWriter->startElement('pageSetUpPr');
            $objWriter->writeAttribute('fitToPage', '1');
            $objWriter->endElement();
        }

        $objWriter->endElement();
    }

    /**
     * Write Dimension.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeDimension(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // dimension
        $objWriter->startElement('dimension');
        $objWriter->writeAttribute('ref', $pSheet->calculateWorksheetDimension());
        $objWriter->endElement();
    }

    /**
     * Write SheetViews.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeSheetViews(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // sheetViews
        $objWriter->startElement('sheetViews');

        // Sheet selected?
        $sheetSelected = false;
        if ($this->getParentWriter()->getSpreadsheet()->getIndex($pSheet) == $this->getParentWriter()->getSpreadsheet()->getActiveSheetIndex()) {
            $sheetSelected = true;
        }

        // sheetView
        $objWriter->startElement('sheetView');
        $objWriter->writeAttribute('tabSelected', $sheetSelected ? '1' : '0');
        $objWriter->writeAttribute('workbookViewId', '0');

        // Zoom scales
        if ($pSheet->getSheetView()->getZoomScale() != 100) {
            $objWriter->writeAttribute('zoomScale', $pSheet->getSheetView()->getZoomScale());
        }
        if ($pSheet->getSheetView()->getZoomScaleNormal() != 100) {
            $objWriter->writeAttribute('zoomScaleNormal', $pSheet->getSheetView()->getZoomScaleNormal());
        }

        // View Layout Type
        if ($pSheet->getSheetView()->getView() !== SheetView::SHEETVIEW_NORMAL) {
            $objWriter->writeAttribute('view', $pSheet->getSheetView()->getView());
        }

        // Gridlines
        if ($pSheet->getShowGridlines()) {
            $objWriter->writeAttribute('showGridLines', 'true');
        } else {
            $objWriter->writeAttribute('showGridLines', 'false');
        }

        // Row and column headers
        if ($pSheet->getShowRowColHeaders()) {
            $objWriter->writeAttribute('showRowColHeaders', '1');
        } else {
            $objWriter->writeAttribute('showRowColHeaders', '0');
        }

        // Right-to-left
        if ($pSheet->getRightToLeft()) {
            $objWriter->writeAttribute('rightToLeft', 'true');
        }

        $activeCell = $pSheet->getActiveCell();

        // Pane
        $pane = '';
        if ($pSheet->getFreezePane()) {
            list($xSplit, $ySplit) = Coordinate::coordinateFromString($pSheet->getFreezePane());
            $xSplit = Coordinate::columnIndexFromString($xSplit);
            --$xSplit;
            --$ySplit;

            $topLeftCell = $pSheet->getTopLeftCell();
            $activeCell = $topLeftCell;

            // pane
            $pane = 'topRight';
            $objWriter->startElement('pane');
            if ($xSplit > 0) {
                $objWriter->writeAttribute('xSplit', $xSplit);
            }
            if ($ySplit > 0) {
                $objWriter->writeAttribute('ySplit', $ySplit);
                $pane = ($xSplit > 0) ? 'bottomRight' : 'bottomLeft';
            }
            $objWriter->writeAttribute('topLeftCell', $topLeftCell);
            $objWriter->writeAttribute('activePane', $pane);
            $objWriter->writeAttribute('state', 'frozen');
            $objWriter->endElement();

            if (($xSplit > 0) && ($ySplit > 0)) {
                //    Write additional selections if more than two panes (ie both an X and a Y split)
                $objWriter->startElement('selection');
                $objWriter->writeAttribute('pane', 'topRight');
                $objWriter->endElement();
                $objWriter->startElement('selection');
                $objWriter->writeAttribute('pane', 'bottomLeft');
                $objWriter->endElement();
            }
        }

        // Selection
        // Only need to write selection element if we have a split pane
        // We cheat a little by over-riding the active cell selection, setting it to the split cell
        $objWriter->startElement('selection');
        if ($pane != '') {
            $objWriter->writeAttribute('pane', $pane);
        }
        $objWriter->writeAttribute('activeCell', $activeCell);
        $objWriter->writeAttribute('sqref', $activeCell);
        $objWriter->endElement();

        $objWriter->endElement();

        $objWriter->endElement();
    }

    /**
     * Write SheetFormatPr.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeSheetFormatPr(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // sheetFormatPr
        $objWriter->startElement('sheetFormatPr');

        // Default row height
        if ($pSheet->getDefaultRowDimension()->getRowHeight() >= 0) {
            $objWriter->writeAttribute('customHeight', 'true');
            $objWriter->writeAttribute('defaultRowHeight', StringHelper::formatNumber($pSheet->getDefaultRowDimension()->getRowHeight()));
        } else {
            $objWriter->writeAttribute('defaultRowHeight', '14.4');
        }

        // Set Zero Height row
        if ((string) $pSheet->getDefaultRowDimension()->getZeroHeight() == '1' ||
            strtolower((string) $pSheet->getDefaultRowDimension()->getZeroHeight()) == 'true') {
            $objWriter->writeAttribute('zeroHeight', '1');
        }

        // Default column width
        if ($pSheet->getDefaultColumnDimension()->getWidth() >= 0) {
            $objWriter->writeAttribute('defaultColWidth', StringHelper::formatNumber($pSheet->getDefaultColumnDimension()->getWidth()));
        }

        // Outline level - row
        $outlineLevelRow = 0;
        foreach ($pSheet->getRowDimensions() as $dimension) {
            if ($dimension->getOutlineLevel() > $outlineLevelRow) {
                $outlineLevelRow = $dimension->getOutlineLevel();
            }
        }
        $objWriter->writeAttribute('outlineLevelRow', (int) $outlineLevelRow);

        // Outline level - column
        $outlineLevelCol = 0;
        foreach ($pSheet->getColumnDimensions() as $dimension) {
            if ($dimension->getOutlineLevel() > $outlineLevelCol) {
                $outlineLevelCol = $dimension->getOutlineLevel();
            }
        }
        $objWriter->writeAttribute('outlineLevelCol', (int) $outlineLevelCol);

        $objWriter->endElement();
    }

    /**
     * Write Cols.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeCols(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // cols
        if (count($pSheet->getColumnDimensions()) > 0) {
            $objWriter->startElement('cols');

            $pSheet->calculateColumnWidths();

            // Loop through column dimensions
            foreach ($pSheet->getColumnDimensions() as $colDimension) {
                // col
                $objWriter->startElement('col');
                $objWriter->writeAttribute('min', Coordinate::columnIndexFromString($colDimension->getColumnIndex()));
                $objWriter->writeAttribute('max', Coordinate::columnIndexFromString($colDimension->getColumnIndex()));

                if ($colDimension->getWidth() < 0) {
                    // No width set, apply default of 10
                    $objWriter->writeAttribute('width', '9.10');
                } else {
                    // Width set
                    $objWriter->writeAttribute('width', StringHelper::formatNumber($colDimension->getWidth()));
                }

                // Column visibility
                if ($colDimension->getVisible() == false) {

It seems like you are loosely comparing two booleans. Considering using the strict comparison === instead.

                    $objWriter->writeAttribute('hidden', 'true');
                }

                // Auto size?
                if ($colDimension->getAutoSize()) {
                    $objWriter->writeAttribute('bestFit', 'true');
                }

                // Custom width?
                if ($colDimension->getWidth() != $pSheet->getDefaultColumnDimension()->getWidth()) {
                    $objWriter->writeAttribute('customWidth', 'true');
                }

                // Collapsed
                if ($colDimension->getCollapsed() == true) {

It seems like you are loosely comparing two booleans. Considering using the strict comparison === instead.

                    $objWriter->writeAttribute('collapsed', 'true');
                }

                // Outline level
                if ($colDimension->getOutlineLevel() > 0) {
                    $objWriter->writeAttribute('outlineLevel', $colDimension->getOutlineLevel());
                }

                // Style
                $objWriter->writeAttribute('style', $colDimension->getXfIndex());

                $objWriter->endElement();
            }

            $objWriter->endElement();
        }
    }

    /**
     * Write SheetProtection.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeSheetProtection(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // sheetProtection
        $objWriter->startElement('sheetProtection');

        if ($pSheet->getProtection()->getPassword() != '') {
            $objWriter->writeAttribute('password', $pSheet->getProtection()->getPassword());
        }

        $objWriter->writeAttribute('sheet', ($pSheet->getProtection()->getSheet() ? 'true' : 'false'));
        $objWriter->writeAttribute('objects', ($pSheet->getProtection()->getObjects() ? 'true' : 'false'));
        $objWriter->writeAttribute('scenarios', ($pSheet->getProtection()->getScenarios() ? 'true' : 'false'));
        $objWriter->writeAttribute('formatCells', ($pSheet->getProtection()->getFormatCells() ? 'true' : 'false'));
        $objWriter->writeAttribute('formatColumns', ($pSheet->getProtection()->getFormatColumns() ? 'true' : 'false'));
        $objWriter->writeAttribute('formatRows', ($pSheet->getProtection()->getFormatRows() ? 'true' : 'false'));
        $objWriter->writeAttribute('insertColumns', ($pSheet->getProtection()->getInsertColumns() ? 'true' : 'false'));
        $objWriter->writeAttribute('insertRows', ($pSheet->getProtection()->getInsertRows() ? 'true' : 'false'));
        $objWriter->writeAttribute('insertHyperlinks', ($pSheet->getProtection()->getInsertHyperlinks() ? 'true' : 'false'));
        $objWriter->writeAttribute('deleteColumns', ($pSheet->getProtection()->getDeleteColumns() ? 'true' : 'false'));
        $objWriter->writeAttribute('deleteRows', ($pSheet->getProtection()->getDeleteRows() ? 'true' : 'false'));
        $objWriter->writeAttribute('selectLockedCells', ($pSheet->getProtection()->getSelectLockedCells() ? 'true' : 'false'));
        $objWriter->writeAttribute('sort', ($pSheet->getProtection()->getSort() ? 'true' : 'false'));
        $objWriter->writeAttribute('autoFilter', ($pSheet->getProtection()->getAutoFilter() ? 'true' : 'false'));
        $objWriter->writeAttribute('pivotTables', ($pSheet->getProtection()->getPivotTables() ? 'true' : 'false'));
        $objWriter->writeAttribute('selectUnlockedCells', ($pSheet->getProtection()->getSelectUnlockedCells() ? 'true' : 'false'));
        $objWriter->endElement();
    }

    /**
     * Write ConditionalFormatting.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeConditionalFormatting(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // Conditional id
        $id = 1;

        // Loop through styles in the current worksheet
        foreach ($pSheet->getConditionalStylesCollection() as $cellCoordinate => $conditionalStyles) {
            foreach ($conditionalStyles as $conditional) {
                // WHY was this again?
                // if ($this->getParentWriter()->getStylesConditionalHashTable()->getIndexForHashCode($conditional->getHashCode()) == '') {

66% of this comment could be valid code. Did you maybe forget this after debugging?

                //    continue;
                // }
                if ($conditional->getConditionType() != Conditional::CONDITION_NONE) {
                    // conditionalFormatting
                    $objWriter->startElement('conditionalFormatting');
                    $objWriter->writeAttribute('sqref', $cellCoordinate);

                    // cfRule
                    $objWriter->startElement('cfRule');
                    $objWriter->writeAttribute('type', $conditional->getConditionType());
                    $objWriter->writeAttribute('dxfId', $this->getParentWriter()->getStylesConditionalHashTable()->getIndexForHashCode($conditional->getHashCode()));
                    $objWriter->writeAttribute('priority', $id++);

                    if (($conditional->getConditionType() == Conditional::CONDITION_CELLIS || $conditional->getConditionType() == Conditional::CONDITION_CONTAINSTEXT)
                        && $conditional->getOperatorType() != Conditional::OPERATOR_NONE) {
                        $objWriter->writeAttribute('operator', $conditional->getOperatorType());
                    }

                    if ($conditional->getConditionType() == Conditional::CONDITION_CONTAINSTEXT
                        && $conditional->getText() !== null) {
                        $objWriter->writeAttribute('text', $conditional->getText());
                    }

                    if ($conditional->getStopIfTrue()) {
                        $objWriter->writeAttribute('stopIfTrue', '1');
                    }

                    if ($conditional->getConditionType() == Conditional::CONDITION_CONTAINSTEXT
                        && $conditional->getOperatorType() == Conditional::OPERATOR_CONTAINSTEXT
                        && $conditional->getText() !== null) {
                        $objWriter->writeElement('formula', 'NOT(ISERROR(SEARCH("' . $conditional->getText() . '",' . $cellCoordinate . ')))');
                    } elseif ($conditional->getConditionType() == Conditional::CONDITION_CONTAINSTEXT
                        && $conditional->getOperatorType() == Conditional::OPERATOR_BEGINSWITH
                        && $conditional->getText() !== null) {
                        $objWriter->writeElement('formula', 'LEFT(' . $cellCoordinate . ',' . strlen($conditional->getText()) . ')="' . $conditional->getText() . '"');
                    } elseif ($conditional->getConditionType() == Conditional::CONDITION_CONTAINSTEXT
                        && $conditional->getOperatorType() == Conditional::OPERATOR_ENDSWITH
                        && $conditional->getText() !== null) {
                        $objWriter->writeElement('formula', 'RIGHT(' . $cellCoordinate . ',' . strlen($conditional->getText()) . ')="' . $conditional->getText() . '"');
                    } elseif ($conditional->getConditionType() == Conditional::CONDITION_CONTAINSTEXT
                        && $conditional->getOperatorType() == Conditional::OPERATOR_NOTCONTAINS
                        && $conditional->getText() !== null) {
                        $objWriter->writeElement('formula', 'ISERROR(SEARCH("' . $conditional->getText() . '",' . $cellCoordinate . '))');
                    } elseif ($conditional->getConditionType() == Conditional::CONDITION_CELLIS
                        || $conditional->getConditionType() == Conditional::CONDITION_CONTAINSTEXT
                        || $conditional->getConditionType() == Conditional::CONDITION_EXPRESSION) {
                        foreach ($conditional->getConditions() as $formula) {
                            // Formula
                            $objWriter->writeElement('formula', $formula);
                        }
                    }

                    $objWriter->endElement();

                    $objWriter->endElement();
                }
            }
        }
    }

    /**
     * Write DataValidations.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeDataValidations(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // Datavalidation collection
        $dataValidationCollection = $pSheet->getDataValidationCollection();

        // Write data validations?
        if (!empty($dataValidationCollection)) {
            $dataValidationCollection = Coordinate::mergeRangesInCollection($dataValidationCollection);
            $objWriter->startElement('dataValidations');
            $objWriter->writeAttribute('count', count($dataValidationCollection));

            foreach ($dataValidationCollection as $coordinate => $dv) {
                $objWriter->startElement('dataValidation');

                if ($dv->getType() != '') {
                    $objWriter->writeAttribute('type', $dv->getType());
                }

                if ($dv->getErrorStyle() != '') {
                    $objWriter->writeAttribute('errorStyle', $dv->getErrorStyle());
                }

                if ($dv->getOperator() != '') {
                    $objWriter->writeAttribute('operator', $dv->getOperator());
                }

                $objWriter->writeAttribute('allowBlank', ($dv->getAllowBlank() ? '1' : '0'));
                $objWriter->writeAttribute('showDropDown', (!$dv->getShowDropDown() ? '1' : '0'));
                $objWriter->writeAttribute('showInputMessage', ($dv->getShowInputMessage() ? '1' : '0'));
                $objWriter->writeAttribute('showErrorMessage', ($dv->getShowErrorMessage() ? '1' : '0'));

                if ($dv->getErrorTitle() !== '') {
                    $objWriter->writeAttribute('errorTitle', $dv->getErrorTitle());
                }
                if ($dv->getError() !== '') {
                    $objWriter->writeAttribute('error', $dv->getError());
                }
                if ($dv->getPromptTitle() !== '') {
                    $objWriter->writeAttribute('promptTitle', $dv->getPromptTitle());
                }
                if ($dv->getPrompt() !== '') {
                    $objWriter->writeAttribute('prompt', $dv->getPrompt());
                }

                $objWriter->writeAttribute('sqref', $coordinate);

                if ($dv->getFormula1() !== '') {
                    $objWriter->writeElement('formula1', $dv->getFormula1());
                }
                if ($dv->getFormula2() !== '') {
                    $objWriter->writeElement('formula2', $dv->getFormula2());
                }

                $objWriter->endElement();
            }

            $objWriter->endElement();
        }
    }

    /**
     * Write Hyperlinks.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeHyperlinks(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // Hyperlink collection
        $hyperlinkCollection = $pSheet->getHyperlinkCollection();

        // Relation ID
        $relationId = 1;

        // Write hyperlinks?
        if (!empty($hyperlinkCollection)) {
            $objWriter->startElement('hyperlinks');

            foreach ($hyperlinkCollection as $coordinate => $hyperlink) {
                $objWriter->startElement('hyperlink');

                $objWriter->writeAttribute('ref', $coordinate);
                if (!$hyperlink->isInternal()) {
                    $objWriter->writeAttribute('r:id', 'rId_hyperlink_' . $relationId);
                    ++$relationId;
                } else {
                    $objWriter->writeAttribute('location', str_replace('sheet://', '', $hyperlink->getUrl()));
                }

                if ($hyperlink->getTooltip() != '') {
                    $objWriter->writeAttribute('tooltip', $hyperlink->getTooltip());
                }

                $objWriter->endElement();
            }

            $objWriter->endElement();
        }
    }

    /**
     * Write ProtectedRanges.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeProtectedRanges(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        if (count($pSheet->getProtectedCells()) > 0) {
            // protectedRanges
            $objWriter->startElement('protectedRanges');

            // Loop protectedRanges
            foreach ($pSheet->getProtectedCells() as $protectedCell => $passwordHash) {
                // protectedRange
                $objWriter->startElement('protectedRange');
                $objWriter->writeAttribute('name', 'p' . md5($protectedCell));
                $objWriter->writeAttribute('sqref', $protectedCell);
                if (!empty($passwordHash)) {
                    $objWriter->writeAttribute('password', $passwordHash);

$passwordHash of type array is incompatible with the type string expected by parameter $value of XMLWriter::writeAttribute().

                }
                $objWriter->endElement();
            }

            $objWriter->endElement();
        }
    }

    /**
     * Write MergeCells.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeMergeCells(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        if (count($pSheet->getMergeCells()) > 0) {
            // mergeCells
            $objWriter->startElement('mergeCells');

            // Loop mergeCells
            foreach ($pSheet->getMergeCells() as $mergeCell) {
                // mergeCell
                $objWriter->startElement('mergeCell');
                $objWriter->writeAttribute('ref', $mergeCell);

$mergeCell of type array is incompatible with the type string expected by parameter $value of XMLWriter::writeAttribute().

                $objWriter->endElement();
            }

            $objWriter->endElement();
        }
    }

    /**
     * Write PrintOptions.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writePrintOptions(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // printOptions
        $objWriter->startElement('printOptions');

        $objWriter->writeAttribute('gridLines', ($pSheet->getPrintGridlines() ? 'true' : 'false'));
        $objWriter->writeAttribute('gridLinesSet', 'true');

        if ($pSheet->getPageSetup()->getHorizontalCentered()) {
            $objWriter->writeAttribute('horizontalCentered', 'true');
        }

        if ($pSheet->getPageSetup()->getVerticalCentered()) {
            $objWriter->writeAttribute('verticalCentered', 'true');
        }

        $objWriter->endElement();
    }

    /**
     * Write PageMargins.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writePageMargins(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // pageMargins
        $objWriter->startElement('pageMargins');
        $objWriter->writeAttribute('left', StringHelper::formatNumber($pSheet->getPageMargins()->getLeft()));
        $objWriter->writeAttribute('right', StringHelper::formatNumber($pSheet->getPageMargins()->getRight()));
        $objWriter->writeAttribute('top', StringHelper::formatNumber($pSheet->getPageMargins()->getTop()));
        $objWriter->writeAttribute('bottom', StringHelper::formatNumber($pSheet->getPageMargins()->getBottom()));
        $objWriter->writeAttribute('header', StringHelper::formatNumber($pSheet->getPageMargins()->getHeader()));
        $objWriter->writeAttribute('footer', StringHelper::formatNumber($pSheet->getPageMargins()->getFooter()));
        $objWriter->endElement();
    }

    /**
     * Write AutoFilter.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeAutoFilter(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        $autoFilterRange = $pSheet->getAutoFilter()->getRange();
        if (!empty($autoFilterRange)) {
            // autoFilter
            $objWriter->startElement('autoFilter');

            // Strip any worksheet reference from the filter coordinates
            $range = Coordinate::splitRange($autoFilterRange);
            $range = $range[0];
            //    Strip any worksheet ref
            if (strpos($range[0], '!') !== false) {
                list($ws, $range[0]) = explode('!', $range[0]);
            }
            $range = implode(':', $range);

            $objWriter->writeAttribute('ref', str_replace('$', '', $range));

            $columns = $pSheet->getAutoFilter()->getColumns();
            if (count($columns) > 0) {
                foreach ($columns as $columnID => $column) {
                    $rules = $column->getRules();
                    if (count($rules) > 0) {
                        $objWriter->startElement('filterColumn');
                        $objWriter->writeAttribute('colId', $pSheet->getAutoFilter()->getColumnOffset($columnID));

                        $objWriter->startElement($column->getFilterType());
                        if ($column->getJoin() == Column::AUTOFILTER_COLUMN_JOIN_AND) {
                            $objWriter->writeAttribute('and', 1);
                        }

                        foreach ($rules as $rule) {
                            if (($column->getFilterType() === Column::AUTOFILTER_FILTERTYPE_FILTER) &&
                                ($rule->getOperator() === Rule::AUTOFILTER_COLUMN_RULE_EQUAL) &&
                                ($rule->getValue() === '')) {
                                //    Filter rule for Blanks
                                $objWriter->writeAttribute('blank', 1);
                            } elseif ($rule->getRuleType() === Rule::AUTOFILTER_RULETYPE_DYNAMICFILTER) {
                                //    Dynamic Filter Rule
                                $objWriter->writeAttribute('type', $rule->getGrouping());
                                $val = $column->getAttribute('val');
                                if ($val !== null) {
                                    $objWriter->writeAttribute('val', $val);
                                }
                                $maxVal = $column->getAttribute('maxVal');
                                if ($maxVal !== null) {
                                    $objWriter->writeAttribute('maxVal', $maxVal);
                                }
                            } elseif ($rule->getRuleType() === Rule::AUTOFILTER_RULETYPE_TOPTENFILTER) {
                                //    Top 10 Filter Rule
                                $objWriter->writeAttribute('val', $rule->getValue());
                                $objWriter->writeAttribute('percent', (($rule->getOperator() === Rule::AUTOFILTER_COLUMN_RULE_TOPTEN_PERCENT) ? '1' : '0'));
                                $objWriter->writeAttribute('top', (($rule->getGrouping() === Rule::AUTOFILTER_COLUMN_RULE_TOPTEN_TOP) ? '1' : '0'));
                            } else {
                                //    Filter, DateGroupItem or CustomFilter
                                $objWriter->startElement($rule->getRuleType());

                                if ($rule->getOperator() !== Rule::AUTOFILTER_COLUMN_RULE_EQUAL) {
                                    $objWriter->writeAttribute('operator', $rule->getOperator());
                                }
                                if ($rule->getRuleType() === Rule::AUTOFILTER_RULETYPE_DATEGROUP) {
                                    // Date Group filters
                                    foreach ($rule->getValue() as $key => $value) {

The expression $rule->getValue() of type string is not traversable.

                                        if ($value > '') {
                                            $objWriter->writeAttribute($key, $value);
                                        }
                                    }
                                    $objWriter->writeAttribute('dateTimeGrouping', $rule->getGrouping());
                                } else {
                                    $objWriter->writeAttribute('val', $rule->getValue());
                                }

                                $objWriter->endElement();
                            }
                        }

                        $objWriter->endElement();

                        $objWriter->endElement();
                    }
                }
            }
            $objWriter->endElement();
        }
    }

    /**
     * Write PageSetup.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writePageSetup(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // pageSetup
        $objWriter->startElement('pageSetup');
        $objWriter->writeAttribute('paperSize', $pSheet->getPageSetup()->getPaperSize());
        $objWriter->writeAttribute('orientation', $pSheet->getPageSetup()->getOrientation());

        if ($pSheet->getPageSetup()->getScale() !== null) {
            $objWriter->writeAttribute('scale', $pSheet->getPageSetup()->getScale());
        }
        if ($pSheet->getPageSetup()->getFitToHeight() !== null) {
            $objWriter->writeAttribute('fitToHeight', $pSheet->getPageSetup()->getFitToHeight());
        } else {
            $objWriter->writeAttribute('fitToHeight', '0');
        }
        if ($pSheet->getPageSetup()->getFitToWidth() !== null) {
            $objWriter->writeAttribute('fitToWidth', $pSheet->getPageSetup()->getFitToWidth());
        } else {
            $objWriter->writeAttribute('fitToWidth', '0');
        }
        if ($pSheet->getPageSetup()->getFirstPageNumber() !== null) {
            $objWriter->writeAttribute('firstPageNumber', $pSheet->getPageSetup()->getFirstPageNumber());
            $objWriter->writeAttribute('useFirstPageNumber', '1');
        }

        $objWriter->endElement();
    }

    /**
     * Write Header / Footer.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeHeaderFooter(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // headerFooter
        $objWriter->startElement('headerFooter');
        $objWriter->writeAttribute('differentOddEven', ($pSheet->getHeaderFooter()->getDifferentOddEven() ? 'true' : 'false'));
        $objWriter->writeAttribute('differentFirst', ($pSheet->getHeaderFooter()->getDifferentFirst() ? 'true' : 'false'));
        $objWriter->writeAttribute('scaleWithDoc', ($pSheet->getHeaderFooter()->getScaleWithDocument() ? 'true' : 'false'));
        $objWriter->writeAttribute('alignWithMargins', ($pSheet->getHeaderFooter()->getAlignWithMargins() ? 'true' : 'false'));

        $objWriter->writeElement('oddHeader', $pSheet->getHeaderFooter()->getOddHeader());
        $objWriter->writeElement('oddFooter', $pSheet->getHeaderFooter()->getOddFooter());
        $objWriter->writeElement('evenHeader', $pSheet->getHeaderFooter()->getEvenHeader());
        $objWriter->writeElement('evenFooter', $pSheet->getHeaderFooter()->getEvenFooter());
        $objWriter->writeElement('firstHeader', $pSheet->getHeaderFooter()->getFirstHeader());
        $objWriter->writeElement('firstFooter', $pSheet->getHeaderFooter()->getFirstFooter());
        $objWriter->endElement();
    }

    /**
     * Write Breaks.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeBreaks(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // Get row and column breaks
        $aRowBreaks = [];
        $aColumnBreaks = [];
        foreach ($pSheet->getBreaks() as $cell => $breakType) {
            if ($breakType == PhpspreadsheetWorksheet::BREAK_ROW) {
                $aRowBreaks[] = $cell;
            } elseif ($breakType == PhpspreadsheetWorksheet::BREAK_COLUMN) {
                $aColumnBreaks[] = $cell;
            }
        }

        // rowBreaks
        if (!empty($aRowBreaks)) {
            $objWriter->startElement('rowBreaks');
            $objWriter->writeAttribute('count', count($aRowBreaks));
            $objWriter->writeAttribute('manualBreakCount', count($aRowBreaks));

            foreach ($aRowBreaks as $cell) {
                $coords = Coordinate::coordinateFromString($cell);

                $objWriter->startElement('brk');
                $objWriter->writeAttribute('id', $coords[1]);
                $objWriter->writeAttribute('man', '1');
                $objWriter->endElement();
            }

            $objWriter->endElement();
        }

        // Second, write column breaks
        if (!empty($aColumnBreaks)) {
            $objWriter->startElement('colBreaks');
            $objWriter->writeAttribute('count', count($aColumnBreaks));
            $objWriter->writeAttribute('manualBreakCount', count($aColumnBreaks));

            foreach ($aColumnBreaks as $cell) {
                $coords = Coordinate::coordinateFromString($cell);

                $objWriter->startElement('brk');
                $objWriter->writeAttribute('id', Coordinate::columnIndexFromString($coords[0]) - 1);
                $objWriter->writeAttribute('man', '1');
                $objWriter->endElement();
            }

            $objWriter->endElement();
        }
    }

    /**
     * Write SheetData.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     * @param string[] $pStringTable String table
     *
     * @throws WriterException
     */
    private function writeSheetData(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet, array $pStringTable)
    {
        // Flipped stringtable, for faster index searching
        $aFlippedStringTable = $this->getParentWriter()->getWriterPart('stringtable')->flipStringTable($pStringTable);

The method flipStringTable() does not exist on PhpOffice\PhpSpreadsheet\Writer\Xlsx\WriterPart. It seems like you code against a sub-type of PhpOffice\PhpSpreadsheet\Writer\Xlsx\WriterPart such as PhpOffice\PhpSpreadsheet\Writer\Xlsx\StringTable.

        // sheetData
        $objWriter->startElement('sheetData');

        // Get column count
        $colCount = Coordinate::columnIndexFromString($pSheet->getHighestColumn());

        // Highest row number
        $highestRow = $pSheet->getHighestRow();

        // Loop through cells
        $cellsByRow = [];
        foreach ($pSheet->getCoordinates() as $coordinate) {
            $cellAddress = Coordinate::coordinateFromString($coordinate);
            $cellsByRow[$cellAddress[1]][] = $coordinate;
        }

        $currentRow = 0;
        while ($currentRow++ < $highestRow) {
            // Get row dimension
            $rowDimension = $pSheet->getRowDimension($currentRow);

            // Write current row?
            $writeCurrentRow = isset($cellsByRow[$currentRow]) || $rowDimension->getRowHeight() >= 0 || $rowDimension->getVisible() == false || $rowDimension->getCollapsed() == true || $rowDimension->getOutlineLevel() > 0 || $rowDimension->getXfIndex() !== null;

It seems like you are loosely comparing two booleans. Considering using the strict comparison === instead.

            if ($writeCurrentRow) {
                // Start a new row
                $objWriter->startElement('row');
                $objWriter->writeAttribute('r', $currentRow);
                $objWriter->writeAttribute('spans', '1:' . $colCount);

                // Row dimensions
                if ($rowDimension->getRowHeight() >= 0) {
                    $objWriter->writeAttribute('customHeight', '1');
                    $objWriter->writeAttribute('ht', StringHelper::formatNumber($rowDimension->getRowHeight()));
                }

                // Row visibility
                if ($rowDimension->getVisible() == false) {

It seems like you are loosely comparing two booleans. Considering using the strict comparison === instead.

                    $objWriter->writeAttribute('hidden', 'true');
                }

                // Collapsed
                if ($rowDimension->getCollapsed() == true) {

It seems like you are loosely comparing two booleans. Considering using the strict comparison === instead.

                    $objWriter->writeAttribute('collapsed', 'true');
                }

                // Outline level
                if ($rowDimension->getOutlineLevel() > 0) {
                    $objWriter->writeAttribute('outlineLevel', $rowDimension->getOutlineLevel());
                }

                // Style
                if ($rowDimension->getXfIndex() !== null) {
                    $objWriter->writeAttribute('s', $rowDimension->getXfIndex());
                    $objWriter->writeAttribute('customFormat', '1');
                }

                // Write cells
                if (isset($cellsByRow[$currentRow])) {
                    foreach ($cellsByRow[$currentRow] as $cellAddress) {
                        // Write cell
                        $this->writeCell($objWriter, $pSheet, $cellAddress, $aFlippedStringTable);
                    }
                }

                // End row
                $objWriter->endElement();
            }
        }

        $objWriter->endElement();
    }

    /**
     * Write Cell.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     * @param Cell $pCellAddress Cell Address
     * @param string[] $pFlippedStringTable String table (flipped), for faster index searching
     *
     * @throws WriterException
     */
    private function writeCell(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet, $pCellAddress, array $pFlippedStringTable)
    {
        // Cell
        $pCell = $pSheet->getCell($pCellAddress);
        $objWriter->startElement('c');
        $objWriter->writeAttribute('r', $pCellAddress);

        // Sheet styles
        if ($pCell->getXfIndex() != '') {
            $objWriter->writeAttribute('s', $pCell->getXfIndex());
        }

        // If cell value is supplied, write cell value
        $cellValue = $pCell->getValue();
        if (is_object($cellValue) || $cellValue !== '') {
            // Map type
            $mappedType = $pCell->getDataType();

            // Write data type depending on its type
            switch (strtolower($mappedType)) {
                case 'inlinestr':    // Inline string
                case 's':            // String
                case 'b':            // Boolean
                    $objWriter->writeAttribute('t', $mappedType);

                    break;
                case 'f':            // Formula
                    $calculatedValue = ($this->getParentWriter()->getPreCalculateFormulas()) ?
                        $pCell->getCalculatedValue() : $cellValue;
                    if (is_string($calculatedValue)) {
                        $objWriter->writeAttribute('t', 'str');
                    }

                    break;
                case 'e':            // Error
                    $objWriter->writeAttribute('t', $mappedType);
            }

            // Write data depending on its type
            switch (strtolower($mappedType)) {
                case 'inlinestr':    // Inline string
                    if (!$cellValue instanceof RichText) {
                        $objWriter->writeElement('t', StringHelper::controlCharacterPHP2OOXML(htmlspecialchars($cellValue)));
                    } elseif ($cellValue instanceof RichText) {
                        $objWriter->startElement('is');
                        $this->getParentWriter()->getWriterPart('stringtable')->writeRichText($objWriter, $cellValue);

The method writeRichText() does not exist on PhpOffice\PhpSpreadsheet\Writer\Xlsx\WriterPart. It seems like you code against a sub-type of PhpOffice\PhpSpreadsheet\Writer\Xlsx\WriterPart such as PhpOffice\PhpSpreadsheet\Writer\Xlsx\StringTable.

                        $objWriter->endElement();
                    }

                    break;
                case 's':            // String
                    if (!$cellValue instanceof RichText) {
                        if (isset($pFlippedStringTable[$cellValue])) {
                            $objWriter->writeElement('v', $pFlippedStringTable[$cellValue]);
                        }
                    } elseif ($cellValue instanceof RichText) {
                        $objWriter->writeElement('v', $pFlippedStringTable[$cellValue->getHashCode()]);
                    }

                    break;
                case 'f':            // Formula
                    $attributes = $pCell->getFormulaAttributes();
                    if ($attributes['t'] == 'array') {
                        $objWriter->startElement('f');
                        $objWriter->writeAttribute('t', 'array');
                        $objWriter->writeAttribute('ref', $pCellAddress);
                        $objWriter->writeAttribute('aca', '1');
                        $objWriter->writeAttribute('ca', '1');
                        $objWriter->text(substr($cellValue, 1));
                        $objWriter->endElement();
                    } else {
                        $objWriter->writeElement('f', substr($cellValue, 1));
                    }
                    if ($this->getParentWriter()->getOffice2003Compatibility() === false) {
                        if ($this->getParentWriter()->getPreCalculateFormulas()) {
                            if (!is_array($calculatedValue) && substr($calculatedValue, 0, 1) != '#') {

The variable $calculatedValue does not seem to be defined for all execution paths leading up to this point.

                                $objWriter->writeElement('v', StringHelper::formatNumber($calculatedValue));
                            } else {
                                $objWriter->writeElement('v', '0');
                            }
                        } else {
                            $objWriter->writeElement('v', '0');
                        }
                    }

                    break;
                case 'n':            // Numeric
                    // force point as decimal separator in case current locale uses comma
                    $objWriter->writeElement('v', str_replace(',', '.', $cellValue));

                    break;
                case 'b':            // Boolean
                    $objWriter->writeElement('v', ($cellValue ? '1' : '0'));

                    break;
                case 'e':            // Error
                    if (substr($cellValue, 0, 1) == '=') {
                        $objWriter->writeElement('f', substr($cellValue, 1));
                        $objWriter->writeElement('v', substr($cellValue, 1));
                    } else {
                        $objWriter->writeElement('v', $cellValue);
                    }

                    break;
            }
        }

        $objWriter->endElement();
    }

    /**
     * Write Drawings.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     * @param bool $includeCharts Flag indicating if we should include drawing details for charts
     *
     * @throws WriterException
     */
    private function writeDrawings(XMLWriter $objWriter = null, PhpspreadsheetWorksheet $pSheet = null, $includeCharts = false)
    {
        $chartCount = ($includeCharts) ? $pSheet->getChartCollection()->count() : 0;

The method getChartCollection() does not exist on null.

        // If sheet contains drawings, add the relationships
        if (($pSheet->getDrawingCollection()->count() > 0) ||
            ($chartCount > 0)) {
            $objWriter->startElement('drawing');

The method startElement() does not exist on null.

            $objWriter->writeAttribute('r:id', 'rId1');
            $objWriter->endElement();
        }
    }

    /**
     * Write LegacyDrawing.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeLegacyDrawing(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // If sheet contains comments, add the relationships
        if (count($pSheet->getComments()) > 0) {
            $objWriter->startElement('legacyDrawing');
            $objWriter->writeAttribute('r:id', 'rId_comments_vml1');
            $objWriter->endElement();
        }
    }

    /**
     * Write LegacyDrawingHF.
     *
     * @param XMLWriter $objWriter XML Writer
     * @param PhpspreadsheetWorksheet $pSheet Worksheet
     *
     * @throws WriterException
     */
    private function writeLegacyDrawingHF(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // If sheet contains images, add the relationships
        if (count($pSheet->getHeaderFooter()->getImages()) > 0) {
            $objWriter->startElement('legacyDrawingHF');
            $objWriter->writeAttribute('r:id', 'rId_headerfooter_vml1');
            $objWriter->endElement();
        }
    }
}