Convert pdf / PHP / Imagick

readme.md

This snippet show how downgrade a PDF not mergeable with PDFMerger using Imagick and Ghostscript.

convertPdf.php

$sPathName = realpath($oFile->getPathname());
$oIm = new Imagick($sPathName);
$iNoOfPagesInPDF = $oIm->getNumberImages();

if ($iNoOfPagesInPDF) {
    $aPdfPagePath = [];

    for ($i = 0; $i < $iNoOfPagesInPDF; $i++) {
        $sUrl = $sPathName . '[' . $i . ']';
        $sPath = '/tmp/' . $oFile->getFilename() . '_' . ($i + 1) . '.pdf';
        $oImage = new Imagick();
        $oImage->setResolution(300, 300);
        $oImage->readImage($sUrl);
        $oImage->setImageFormat("pdf");
        $oImage->writeImage($sPath);
        $oImage->clear();
        $oImage->destroy();
        $aPdfPagePath[] = $sPath;
    }

    //Add pdf uploaded to the original pdf
    $oPdf = new PDFMerger();

    foreach ($aPdfPagePath as $sPath) {
        $oPdf->addPDF($sPath);
    }

    $oPdf->merge('file', $sPathName . '.pdf', 'P');
}
$oIm->clear();
$oIm->destroy();