如何使用 php 旋转 pdf 文档？

composer require setasign/fpdi
composer require setasign/fpdi_pdf-tk

<?php
require_once('vendor/autoload.php');

use setasign\Fpdi\Fpdi;
use setasign\Fpdi\PdfParser\PdfParserException;
use setasign\Fpdi\PdfReader\PdfReaderException;
use setasign\Fpdi\PdfTools\Pdf;

class PDFRotator extends Fpdi
{
    public function RotatePage($pageNumber, $rotation)
    {
        $pageCount = $this->getPageCount();
        if ($pageNumber > $pageCount) {
            throw new Exception('Invalid page number');
        }

        $pageId = $this->getPageId($pageNumber);
        $pageDictionary = $this->getPageDictionary($pageId);
        $rotatedPagesDictionary = $this->getRotatedPagesDictionary();

        $rotatedPageId = $this->createRotatedPage($pageId, $rotation);
        $rotatedPagesDictionary->addPage($rotatedPageId);

        $this->setPage($pageNumber, $rotatedPageId);
    }

    private function getRotatedPagesDictionary()
    {
        if (!isset($this->rotatedPagesDictionary)) {
            $this->rotatedPagesDictionary = new Pdf\RotatedPagesDictionary($this->getPdfParser(), $this->getPdfWriter());
        }

        return $this->rotatedPagesDictionary;
    }

    private function createRotatedPage($pageId, $rotation)
    {
        $pageContent = $this->getPageContent($pageId);
        $pageDictionary = $this->getPageDictionary($pageId);

        $rotatedPageId = $this->getPdfWriter()->createPage(
            $pageDictionary->getWidth(),
            $pageDictionary->getHeight()
        );

        $rotatedPageContent = $this->getPdfWriter()->createContent();
        $rotatedPageContent->write('q ' . $rotation . ' 0 0 ' . $pageDictionary->getHeight() . ' ' . $pageDictionary->getWidth() . ' 0 cm');
        $rotatedPageContent->write($pageContent);
        $rotatedPageContent->write('Q');

        $this->getPdfWriter()->writePage($rotatedPageId, $rotatedPageContent);

        return $rotatedPageId;
    }
}

$pdf = new PDFRotator();
$pageCount = $pdf->setSourceFile('path/to/your/pdf/file.pdf');

// Rotate the first page 90 degrees clockwise
$pdf->RotatePage(1, -90);

// Rotate the second page 180 degrees
$pdf->RotatePage(2, 180);

// Rotate the third page 90 degrees counter-clockwise
$pdf->RotatePage(3, 90);

$pdf->Output('path/to/output/rotated.pdf', 'F');