Mpdf.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Writer\Pdf;

use PhpOffice\PhpSpreadsheet\Worksheet\PageSetup;
use PhpOffice\PhpSpreadsheet\Writer\Pdf;

class Mpdf extends Pdf
{
    protected function createExternalWriterInstance($config)
    {
        return new \Mpdf\Mpdf($config);
    }

    public function save($pFilename): void
    {
        $fileHandle = parent::prepareForSave($pFilename);

        //  Default PDF paper size
        $paperSize = 'LETTER'; //    Letter    (8.5 in. by 11 in.)

        //  Check for paper size and page orientation
        if (null === $this->getSheetIndex()) {
            $orientation = ($this->spreadsheet->getSheet(0)->getPageSetup()->getOrientation()
                == PageSetup::ORIENTATION_LANDSCAPE) ? 'L' : 'P';
            $printPaperSize = $this->spreadsheet->getSheet(0)->getPageSetup()->getPaperSize();
        } else {
            $orientation = ($this->spreadsheet->getSheet($this->getSheetIndex())->getPageSetup()->getOrientation()
                == PageSetup::ORIENTATION_LANDSCAPE) ? 'L' : 'P';
            $printPaperSize = $this->spreadsheet->getSheet($this->getSheetIndex())->getPageSetup()->getPaperSize();
        }
        $this->setOrientation($orientation);

        //  Override Page Orientation
        if (null !== $this->getOrientation()) {
            $orientation = ($this->getOrientation() == PageSetup::ORIENTATION_DEFAULT)
                ? PageSetup::ORIENTATION_PORTRAIT
                : $this->getOrientation();
        }
        $orientation = strtoupper($orientation);

        //  Override Paper Size
        if (null !== $this->getPaperSize()) {
            $printPaperSize = $this->getPaperSize();
        }

        if (isset(self::$paperSizes[$printPaperSize])) {
            $paperSize = self::$paperSizes[$printPaperSize];
        }

        //  Create PDF
        $config = ['tempDir' => $this->tempDir . '/mpdf'];
        $pdf = $this->createExternalWriterInstance($config);
        $ortmp = $orientation;
        $pdf->_setPageSize($paperSize, $ortmp);
        $pdf->DefOrientation = $orientation;
        $pdf->AddPageByArray([
            'orientation' => $orientation,
            'margin-left' => $this->inchesToMm($this->spreadsheet->getActiveSheet()->getPageMargins()->getLeft()),
            'margin-right' => $this->inchesToMm($this->spreadsheet->getActiveSheet()->getPageMargins()->getRight()),
            'margin-top' => $this->inchesToMm($this->spreadsheet->getActiveSheet()->getPageMargins()->getTop()),
            'margin-bottom' => $this->inchesToMm($this->spreadsheet->getActiveSheet()->getPageMargins()->getBottom()),
        ]);

        //  Document info
        $pdf->SetTitle($this->spreadsheet->getProperties()->getTitle());
        $pdf->SetAuthor($this->spreadsheet->getProperties()->getCreator());
        $pdf->SetSubject($this->spreadsheet->getProperties()->getSubject());
        $pdf->SetKeywords($this->spreadsheet->getProperties()->getKeywords());
        $pdf->SetCreator($this->spreadsheet->getProperties()->getCreator());

        $html = $this->generateHTMLAll();
        foreach (\array_chunk(\explode(PHP_EOL, $html), 1000) as $lines) {
            $pdf->WriteHTML(\implode(PHP_EOL, $lines));
        }

        //  Write to file
        fwrite($fileHandle, $pdf->Output('', 'S'));

        parent::restoreStateAfterSave();
    }

    private function inchesToMm($inches)
    {
        return $inches * 25.4;
    }
}