Generating PDF/A-3A with mPDF Library in PHP

I’m trying to generate a PDF/A-3A document using the mPDF library in PHP, but I keep getting a PDF/A-1B output instead. Here’s the code I’m using:

<?php
require_once __DIR__ . '/autoload.php';

$mpdf = new \Mpdf\Mpdf([
'mode' => 'utf-8',
'format' => 'A4',
'orientation' => 'P',
'margin_left' => 4,
'margin_right' => 4,
'margin_top' => 42,
'margin_bottom' => 20,
'margin_header' => 32,
'margin_footer' => 17,
'default_font' => 'Myriad Pro',
'default_font_size' => 8,
]);

$mpdf->SetDefaultBodyCSS('background', "url('./backgroundimage.jpeg')");
$mpdf->SetDefaultBodyCSS('background-image-resize', 6);

$mpdf->autoScriptToLang = true;
$mpdf->autoLangToFont = true;
$mpdf->SetHTMLHeaderByName('Header');
// Decode the XML content from base64
$xmlDecodedContent = base64_decode($xmlEncodeValue);

// Sanitize $invoiceNo to avoid issues with special characters
$sanitizedInvoiceNo = preg_replace('/[^\w-]/', '_', $invoiceNo);
$customTempDir = 'pdf_attachments';
// Ensure directory exists
if (!file_exists($customTempDir)) {
mkdir($customTempDir, 0777, true); // Create directory if it doesn't exist
}

// Create a temporary file path for the XML (stored in the system's temporary directory)
$xmlTempFilePath = $customTempDir . '/invoice_' . $sanitizedInvoiceNo . '.xml';

// Save the XML content to the temporary file
file_put_contents($xmlTempFilePath, $xmlDecodedContent);

// Embed the temporary XML file into the PDF
$mpdf->SetAssociatedFiles([[
'name' => 'invoice_' . $sanitizedInvoiceNo . '.xml', // The name that will be shown in the PDF
'mime' => 'text/xml', // MIME type
'description' => 'Invoice XML file', // File description
'AFRelationship' => 'Data', // Relationship to the PDF
'content' => $xmlDecodedContent // Content of the XML file
]]);
$rdf = '<rdfescription rdf:about="" xmlns:zf="urn:ferddfa:CrossIndustryDocument:invoice:1p0#">'."\n";
$rdf .= ' <zfocumentType>INVOICE</zfocumentType>'."\n";
$rdf .= ' <zfocumentFileName>ZUGFeRD-invoice.xml</zfocumentFileName>'."\n";
$rdf .= ' <zf:Version>1.0</zf:Version>'."\n";
$rdf .= ' <zf:ConformanceLevel>BASIC</zf:ConformanceLevel>'."\n";
$rdf .= '</rdfescription>'."\n";

$mpdf->SetAdditionalXmpRdf($rdf);

if (file_exists($xmlTempFilePath))
{
unlink($xmlTempFilePath); // Delete the temp file
}
$mpdf->WriteHTML( $htmlContent);
$mpdf->SetHTMLFooterByName('Footer');


ob_clean();
$mpdf->Output('invoice_' . $sanitizedInvoiceNo . '.pdf', 'I');



Current Output: Standard: PDF/A-1B ISO Name: ISO 19005-1 Status: not yet verified Output Intent Identifier: sRGB IEC61966-2.1 Info: sRGB IEC61966-2.1

Desired Output: Standard: PDF/A-3A ISO Name: ISO 19005-3 Status: not yet verified Output Intent Identifier: Custom Info: sRGB IEC61966-2.1

Question: What adjustments do I need to make to my code to ensure that the generated PDF adheres to the PDF/A-3A standard instead of PDF/A-1B? Any guidance or suggestions would be greatly appreciated!

What adjustments do I need to make to my code to ensure that the generated PDF adheres to the PDF/A-3A standard instead of PDF/A-1B? Any guidance or suggestions would be greatly appreciated!

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