log('Write to CSV format'); $writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Csv')->setDelimiter(',') ->setEnclosure('"') ->setSheetIndex(0); $callStartTime = microtime(true); $filename = $helper->getTemporaryFilename('csv'); $writer->save($filename); $helper->logWrite($writer, $filename, $callStartTime); $helper->log('Read from CSV format'); $reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader('Csv')->setDelimiter(',') ->setEnclosure('"') ->setSheetIndex(0); $callStartTime = microtime(true); $spreadsheetFromCSV = $reader->load($filename); $helper->logRead('Csv', $filename, $callStartTime); // Write Xlsx $helper->write($spreadsheetFromCSV, __FILE__, ['Xlsx']); // Write CSV $filenameCSV = $helper->getFilename(__FILE__, 'csv'); $writerCSV = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheetFromCSV, 'Csv'); $writerCSV->setExcelCompatibility(true); $callStartTime = microtime(true); $writerCSV->save($filenameCSV); $helper->logWrite($writerCSV, $filenameCSV, $callStartTime);