/**
  * Save PHPExcel to file
  *
  * @param     string         $pFilename
  * @throws     \PHPExcel\Writer\Exception
  */
 public function save($pFilename = null)
 {
     if ($this->spreadSheet !== null) {
         // garbage collect
         $this->spreadSheet->garbageCollect();
         // If $pFilename is php://output or php://stdout, make it a temporary file...
         $originalFilename = $pFilename;
         if (strtolower($pFilename) == 'php://output' || strtolower($pFilename) == 'php://stdout') {
             $pFilename = @tempnam(\PHPExcel\Shared\File::sysGetTempDir(), 'phpxltmp');
             if ($pFilename == '') {
                 $pFilename = $originalFilename;
             }
         }
         $saveDebugLog = \PHPExcel\Calculation::getInstance($this->spreadSheet)->getDebugLog()->getWriteDebugLog();
         \PHPExcel\Calculation::getInstance($this->spreadSheet)->getDebugLog()->setWriteDebugLog(false);
         $saveDateReturnType = \PHPExcel\Calculation\Functions::getReturnDateType();
         \PHPExcel\Calculation\Functions::setReturnDateType(\PHPExcel\Calculation\Functions::RETURNDATE_EXCEL);
         // Create string lookup table
         $this->stringTable = array();
         for ($i = 0; $i < $this->spreadSheet->getSheetCount(); ++$i) {
             $this->stringTable = $this->getWriterPart('StringTable')->createStringTable($this->spreadSheet->getSheet($i), $this->stringTable);
         }
         // Create styles dictionaries
         $this->styleHashTable->addFromSource($this->getWriterPart('Style')->allStyles($this->spreadSheet));
         $this->stylesConditionalHashTable->addFromSource($this->getWriterPart('Style')->allConditionalStyles($this->spreadSheet));
         $this->fillHashTable->addFromSource($this->getWriterPart('Style')->allFills($this->spreadSheet));
         $this->fontHashTable->addFromSource($this->getWriterPart('Style')->allFonts($this->spreadSheet));
         $this->bordersHashTable->addFromSource($this->getWriterPart('Style')->allBorders($this->spreadSheet));
         $this->numFmtHashTable->addFromSource($this->getWriterPart('Style')->allNumberFormats($this->spreadSheet));
         // Create drawing dictionary
         $this->drawingHashTable->addFromSource($this->getWriterPart('Drawing')->allDrawings($this->spreadSheet));
         // Create new ZIP file and open it for writing
         $zipClass = \PHPExcel\Settings::getZipClass();
         /** @var \ZipArchive $objZip */
         $objZip = new $zipClass();
         //    Retrieve OVERWRITE and CREATE constants from the instantiated zip class
         //    This method of accessing constant values from a dynamic class should work with all appropriate versions of PHP
         $ro = new \ReflectionObject($objZip);
         $zipOverWrite = $ro->getConstant('OVERWRITE');
         $zipCreate = $ro->getConstant('CREATE');
         if (file_exists($pFilename)) {
             unlink($pFilename);
         }
         // Try opening the ZIP file
         if ($objZip->open($pFilename, $zipOverWrite) !== true) {
             if ($objZip->open($pFilename, $zipCreate) !== true) {
                 throw new \PHPExcel\Writer\Exception("Could not open " . $pFilename . " for writing.");
             }
         }
         // Add [Content_Types].xml to ZIP file
         $objZip->addFromString('[Content_Types].xml', $this->getWriterPart('ContentTypes')->writeContentTypes($this->spreadSheet, $this->includeCharts));
         //if hasMacros, add the vbaProject.bin file, Certificate file(if exists)
         if ($this->spreadSheet->hasMacros()) {
             $macrosCode = $this->spreadSheet->getMacrosCode();
             if (!is_null($macrosCode)) {
                 // we have the code ?
                 $objZip->addFromString('xl/vbaProject.bin', $macrosCode);
                 //allways in 'xl', allways named vbaProject.bin
                 if ($this->spreadSheet->hasMacrosCertificate()) {
                     //signed macros ?
                     // Yes : add the certificate file and the related rels file
                     $objZip->addFromString('xl/vbaProjectSignature.bin', $this->spreadSheet->getMacrosCertificate());
                     $objZip->addFromString('xl/_rels/vbaProject.bin.rels', $this->getWriterPart('RelsVBA')->writeVBARelationships($this->spreadSheet));
                 }
             }
         }
         //a custom UI in this workbook ? add it ("base" xml and additional objects (pictures) and rels)
         if ($this->spreadSheet->hasRibbon()) {
             $tmpRibbonTarget = $this->spreadSheet->getRibbonXMLData('target');
             $objZip->addFromString($tmpRibbonTarget, $this->spreadSheet->getRibbonXMLData('data'));
             if ($this->spreadSheet->hasRibbonBinObjects()) {
                 $tmpRootPath = dirname($tmpRibbonTarget) . '/';
                 $ribbonBinObjects = $this->spreadSheet->getRibbonBinObjects('data');
                 //the files to write
                 foreach ($ribbonBinObjects as $aPath => $aContent) {
                     $objZip->addFromString($tmpRootPath . $aPath, $aContent);
                 }
                 //the rels for files
                 $objZip->addFromString($tmpRootPath . '_rels/' . basename($tmpRibbonTarget) . '.rels', $this->getWriterPart('RelsRibbonObjects')->writeRibbonRelationships($this->spreadSheet));
             }
         }
         // Add relationships to ZIP file
         $objZip->addFromString('_rels/.rels', $this->getWriterPart('Rels')->writeRelationships($this->spreadSheet));
         $objZip->addFromString('xl/_rels/workbook.xml.rels', $this->getWriterPart('Rels')->writeWorkbookRelationships($this->spreadSheet));
         // Add document properties to ZIP file
         $objZip->addFromString('docProps/app.xml', $this->getWriterPart('DocProps')->writeDocPropsApp($this->spreadSheet));
         $objZip->addFromString('docProps/core.xml', $this->getWriterPart('DocProps')->writeDocPropsCore($this->spreadSheet));
         $customPropertiesPart = $this->getWriterPart('DocProps')->writeDocPropsCustom($this->spreadSheet);
         if ($customPropertiesPart !== null) {
             $objZip->addFromString('docProps/custom.xml', $customPropertiesPart);
         }
         // Add theme to ZIP file
         $objZip->addFromString('xl/theme/theme1.xml', $this->getWriterPart('Theme')->writeTheme($this->spreadSheet));
         // Add string table to ZIP file
         $objZip->addFromString('xl/sharedStrings.xml', $this->getWriterPart('StringTable')->writeStringTable($this->stringTable));
         // Add styles to ZIP file
         $objZip->addFromString('xl/styles.xml', $this->getWriterPart('Style')->writeStyles($this->spreadSheet));
         // Add workbook to ZIP file
         $objZip->addFromString('xl/workbook.xml', $this->getWriterPart('Workbook')->writeWorkbook($this->spreadSheet, $this->preCalculateFormulas));
         $chartCount = 0;
         // Add worksheets
         for ($i = 0; $i < $this->spreadSheet->getSheetCount(); ++$i) {
             $objZip->addFromString('xl/worksheets/sheet' . ($i + 1) . '.xml', $this->getWriterPart('Worksheet')->writeWorksheet($this->spreadSheet->getSheet($i), $this->stringTable, $this->includeCharts));
             if ($this->includeCharts) {
                 $charts = $this->spreadSheet->getSheet($i)->getChartCollection();
                 if (count($charts) > 0) {
                     foreach ($charts as $chart) {
                         $objZip->addFromString('xl/charts/chart' . ($chartCount + 1) . '.xml', $this->getWriterPart('Chart')->writeChart($chart, $this->preCalculateFormulas));
                         $chartCount++;
                     }
                 }
             }
         }
         $chartRef1 = $chartRef2 = 0;
         // Add worksheet relationships (drawings, ...)
         for ($i = 0; $i < $this->spreadSheet->getSheetCount(); ++$i) {
             // Add relationships
             $objZip->addFromString('xl/worksheets/_rels/sheet' . ($i + 1) . '.xml.rels', $this->getWriterPart('Rels')->writeWorksheetRelationships($this->spreadSheet->getSheet($i), $i + 1, $this->includeCharts));
             $drawings = $this->spreadSheet->getSheet($i)->getDrawingCollection();
             $drawingCount = count($drawings);
             if ($this->includeCharts) {
                 $chartCount = $this->spreadSheet->getSheet($i)->getChartCount();
             }
             // Add drawing and image relationship parts
             if ($drawingCount > 0 || $chartCount > 0) {
                 // Drawing relationships
                 $objZip->addFromString('xl/drawings/_rels/drawing' . ($i + 1) . '.xml.rels', $this->getWriterPart('Rels')->writeDrawingRelationships($this->spreadSheet->getSheet($i), $chartRef1, $this->includeCharts));
                 // Drawings
                 $objZip->addFromString('xl/drawings/drawing' . ($i + 1) . '.xml', $this->getWriterPart('Drawing')->writeDrawings($this->spreadSheet->getSheet($i), $chartRef2, $this->includeCharts));
             }
             // Add comment relationship parts
             if (count($this->spreadSheet->getSheet($i)->getComments()) > 0) {
                 // VML Comments
                 $objZip->addFromString('xl/drawings/vmlDrawing' . ($i + 1) . '.vml', $this->getWriterPart('Comments')->writeVMLComments($this->spreadSheet->getSheet($i)));
                 // Comments
                 $objZip->addFromString('xl/comments' . ($i + 1) . '.xml', $this->getWriterPart('Comments')->writeComments($this->spreadSheet->getSheet($i)));
             }
             // Add header/footer relationship parts
             if (count($this->spreadSheet->getSheet($i)->getHeaderFooter()->getImages()) > 0) {
                 // VML Drawings
                 $objZip->addFromString('xl/drawings/vmlDrawingHF' . ($i + 1) . '.vml', $this->getWriterPart('Drawing')->writeVMLHeaderFooterImages($this->spreadSheet->getSheet($i)));
                 // VML Drawing relationships
                 $objZip->addFromString('xl/drawings/_rels/vmlDrawingHF' . ($i + 1) . '.vml.rels', $this->getWriterPart('Rels')->writeHeaderFooterDrawingRelationships($this->spreadSheet->getSheet($i)));
                 // Media
                 foreach ($this->spreadSheet->getSheet($i)->getHeaderFooter()->getImages() as $image) {
                     $objZip->addFromString('xl/media/' . $image->getIndexedFilename(), file_get_contents($image->getPath()));
                 }
             }
         }
         // Add media
         for ($i = 0; $i < $this->getDrawingHashTable()->count(); ++$i) {
             if ($this->getDrawingHashTable()->getByIndex($i) instanceof \PHPExcel\Worksheet\Drawing) {
                 $imageContents = null;
                 $imagePath = $this->getDrawingHashTable()->getByIndex($i)->getPath();
                 if (strpos($imagePath, 'zip://') !== false) {
                     $imagePath = substr($imagePath, 6);
                     $imagePathSplitted = explode('#', $imagePath);
                     $imageZip = new ZipArchive();
                     $imageZip->open($imagePathSplitted[0]);
                     $imageContents = $imageZip->getFromName($imagePathSplitted[1]);
                     $imageZip->close();
                     unset($imageZip);
                 } else {
                     $imageContents = file_get_contents($imagePath);
                 }
                 $objZip->addFromString('xl/media/' . str_replace(' ', '_', $this->getDrawingHashTable()->getByIndex($i)->getIndexedFilename()), $imageContents);
             } elseif ($this->getDrawingHashTable()->getByIndex($i) instanceof \PHPExcel\Worksheet\MemoryDrawing) {
                 ob_start();
                 call_user_func($this->getDrawingHashTable()->getByIndex($i)->getRenderingFunction(), $this->getDrawingHashTable()->getByIndex($i)->getImageResource());
                 $imageContents = ob_get_contents();
                 ob_end_clean();
                 $objZip->addFromString('xl/media/' . str_replace(' ', '_', $this->getDrawingHashTable()->getByIndex($i)->getIndexedFilename()), $imageContents);
             }
         }
         \PHPExcel\Calculation\Functions::setReturnDateType($saveDateReturnType);
         \PHPExcel\Calculation::getInstance($this->spreadSheet)->getDebugLog()->setWriteDebugLog($saveDebugLog);
         // Close file
         if ($objZip->close() === false) {
             throw new \PHPExcel\Writer\Exception("Could not close zip file {$pFilename}.");
         }
         // If a temporary file was used, copy it to the correct file stream
         if ($originalFilename != $pFilename) {
             if (copy($pFilename, $originalFilename) === false) {
                 throw new \PHPExcel\Writer\Exception("Could not copy temporary zip file {$pFilename} to {$originalFilename}.");
             }
             @unlink($pFilename);
         }
     } else {
         throw new \PHPExcel\Writer\Exception("PHPExcel object unassigned.");
     }
 }