Convert plain PDF to PDF/A-3b

pdfa_convert.php

<?php

use horstoeko\zugferd\ZugferdPdfWriter;

/**
 * Converts a plain PDF to PDF/A-3b (without attachments).
 * @param string $sourcePdf Source PDF file name
 * @param string $destPdf Destination PDF file name (can be the same as the source)
 * @param string $title Title metadata
 * @param string $author Author metadata
 * @param string $creatorTool Creator tool metadata
 * @return void
 */
function convert_pdf_to_pdfa(string $sourcePdf, string $destPdf, string $title, string $author, string $creatorTool=''): void
{
	$pdfWriter = new ZugferdPdfWriter();

	// Copy pages from the original PDF

	$pageCount = $pdfWriter->setSourceFile($sourcePdf);

	for ($pageNumber = 1; $pageNumber <= $pageCount; ++$pageNumber) {
		$pageContent = $pdfWriter->importPage($pageNumber, '/MediaBox');
		$pdfWriter->AddPage();
		$pdfWriter->useTemplate($pageContent, 0, 0, null, null, true);
	}

	// Set PDF version 1.7 according to PDF/A-3 ISO 32000-1

	$pdfWriter->setPdfVersion('1.7', true);

	// Update meta data (e.g. such as author, producer, title)

	$pdfMetadata = array(
		'author' => $author,
		'keywords' => '',
		'title' => $title,
		'subject' => '',
		'createdDate' => date('Y-m-d\TH:i:s') . '+00:00',
		'modifiedDate' => date('Y-m-d\TH:i:s') . '+00:00',
	);
	$pdfWriter->setPdfMetadataInfos($pdfMetadata);

	$xmp = simplexml_load_file(ZugferdSettings::getFullXmpMetaDataFilename());
	$descriptionNodes = $xmp->xpath('rdf:Description');

	// rdf:Description urn:factur-x:pdfa:CrossIndustryDocument:invoice:1p0#
	// $descriptionNodes[0] not applicable

	// Factur-X PDFA Extension Schema http://www.aiim.org/pdfa/ns/extension/
	// $descriptionNodes[1] not applicable

	// rdf:Description http://www.aiim.org/pdfa/ns/id/
	// PDF/A-3b declaration
	$descPdfAid = $descriptionNodes[2];
	$pdfWriter->addMetadataDescriptionNode($descPdfAid->asXML());

	// rdf:Description http://purl.org/dc/elements/1.1/
	$descDc = $descriptionNodes[3];
	$descNodes = $descDc->children('dc', true);
	$descNodes->title->children('rdf', true)->Alt->li = $pdfMetadata['title'];
	$descNodes->creator->children('rdf', true)->Seq->li = $pdfMetadata['author'];
	$descNodes->description->children('rdf', true)->Alt->li = $pdfMetadata['subject'];
	$pdfWriter->addMetadataDescriptionNode($descDc->asXML());

	// rdf:Description http://ns.adobe.com/pdf/1.3/
	$descAdobe = $descriptionNodes[4];
	$descAdobe->children('pdf', true)->{'Producer'} = 'FPDF';
	$pdfWriter->addMetadataDescriptionNode($descAdobe->asXML());

	// rdf:Description http://ns.adobe.com/xap/1.0/
	$descXmp = $descriptionNodes[5];
	$xmpNodes = $descXmp->children('xmp', true);
	$xmpNodes->{'CreatorTool'} = $creatorTool;
	$xmpNodes->{'CreateDate'} = $pdfMetadata['createdDate'];
	$xmpNodes->{'ModifyDate'} = $pdfMetadata['modifiedDate'];
	$pdfWriter->addMetadataDescriptionNode($descXmp->asXML());

	// Save file

	$pdfWriter->Output($destPdf, 'F');
}

Requires this library: https://github.com/horstoeko/zugferd/

wonderful, it is possible also save a pdf with attachments using this function?

@andrex47 With this function not, but it can be added. This code https://github.com/horstoeko/zugferd/blob/master/src/ZugferdDocumentPdfBuilderAbstract.php#L331 does this, so I think you could copy a few lines from there

I have a running horstoeko/zugferd installation, so I’am able to merge a PDF/A with a XML-file. Now I want to insert the function "convert_pdf_to_pdfa" before merging, so I can use a plain PDF for merging.
For testing I put the file "pdfa_convert.php" in the folder "vendor/horstoeko/zugferd/src" and use this test script:

`<?php
use horstoeko\zugferd\pdfa_convert;
require DIR . "/vendor/autoload.php";

// the parameters for the function convert_pdf_to_pdfa()

$sourcePdf = "uploads/" . basename($_FILES["fileToUpload"]["name"]);
$destPdf = "uploads/converted/" . basename($_FILES["fileToUpload"]["name"]);
$title = "Test";
$author = "Christoph Damm";
$creatorTool ='';

convert_pdf_to_pdfa();`

Why does not work it (no error, no output, no converted PDF)?

One more question:
In line 23 ($pageContent = $pdfWriter->importPage($pageNumber, '/MediaBox');) is a folder "/MediaBox".
Does I have to create a folder with that name? Which directory is the right for inserting the folder?

Thank you in advance for your help!

I have a running horstoeko/zugferd installation, so I’am able to merge a PDF/A with a XML-file. Now I want to insert the function "convert_pdf_to_pdfa" before merging, so I can use a plain PDF for merging. For testing I put the file "pdfa_convert.php" in the folder "vendor/horstoeko/zugferd/src" and use this test script:

`<?php use horstoeko\zugferd\pdfa_convert; require DIR . "/vendor/autoload.php";

// the parameters for the function convert_pdf_to_pdfa()

$sourcePdf = "uploads/" . basename($_FILES["fileToUpload"]["name"]); $destPdf = "uploads/converted/" . basename($_FILES["fileToUpload"]["name"]); $title = "Test"; $author = "Christoph Damm"; $creatorTool ='';

convert_pdf_to_pdfa();`

Why does not work it (no error, no output, no converted PDF)?

One more question: In line 23 ($pageContent = $pdfWriter->importPage($pageNumber, '/MediaBox');) is a folder "/MediaBox". Does I have to create a folder with that name? Which directory is the right for inserting the folder?

Thank you in advance for your help!

You need to pass the variables to the method.

<?php
use horstoeko\zugferd\pdfa_convert;
require __DIR__ . "/vendor/autoload.php";

$sourcePdf = "uploads/" . basename($_FILES["fileToUpload"]["name"]);
$destPdf = "uploads/converted/" . basename($_FILES["fileToUpload"]["name"]);
$title = "Test";
$author = "Christoph Damm";
$creatorTool ='';

convert_pdf_to_pdfa($sourcePdf, $destPdf, $title, $author, $creatorTool);

/MediaBox is not a directory. It is a command for PDF files. PDF files have text commands in them like RichText (RTF) files. The commands begin with a slash. So, there is nothing to worry for "/MediaBox"

Thanks Daniel for your quick answer and info!
Now I got it working, but without using the script as a function: I define the 5 variables (param strings) and use only the code inside the function (line 16 to 81) as script. In addition to line 1 "use horstoeko\zugferd\ZugferdPdfWriter;" the line "use horstoeko\zugferd\ZugferdSettings;" was required.