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PHP

Extract Metadata XML from PDF

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Demonstrates how to extract the metadata XML from a PDF.

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Chilkat2 PHP 
<?php

use Chilkat2\Pdf;
use Chilkat2\StringBuilder;
use Chilkat2\Xml;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$pdf = new Pdf();

try {
    $pdf->LoadFile('qa_data/pdf/blank_with_metadata.pdf');

    $sbXml = new StringBuilder();
    // Note: Not all PDF files have metadata.  Metadata is optional.
    $pdf->GetMetadata($sbXml);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

$xml = new Xml();
$xml->LoadSb($sbXml, true);

echo $xml->GetXml(), "\n";

// Sample PDF metadata XML:
// (Code for parsing follows)

// Use this online tool to generate parsing code from sample XML:
// Generate Parsing Code from XML

/*
 * <?xml version="1.0" encoding="utf-8"?>
 * <x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 9.1-c001 79.675d0f7, 2023/06/11-19:21:16        ">
 *     <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
 *         <rdf:Description rdf:about="" xmlns:xmp="http://ns.adobe.com/xap/1.0/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/" xmlns:pdf="http://ns.adobe.com/pdf/1.3/" xmlns:xmpRights="http://ns.adobe.com/xap/1.0/rights/">
 *             <xmp:ModifyDate>2024-11-27T11:33:12-06:00</xmp:ModifyDate>
 *             <xmp:CreateDate>2024-11-27T11:28:23-06:00</xmp:CreateDate>
 *             <xmp:MetadataDate>2024-11-27T11:33:12-06:00</xmp:MetadataDate>
 *             <xmp:CreatorTool>Adobe Acrobat Pro (32-bit) 24.3.20112</xmp:CreatorTool>
 *             <dc:format>application/pdf</dc:format>
 *             <dc:title>
 *                 <rdf:Alt>
 *                     <rdf:li xml:lang="x-default">Blank</rdf:li>
 *                 </rdf:Alt>
 *             </dc:title>
 *             <dc:creator>
 *                 <rdf:Bag>
 *                     <rdf:li>Chilkat Software</rdf:li>
 *                 </rdf:Bag>
 *             </dc:creator>
 *             <dc:description>
 *                 <rdf:Alt>
 *                     <rdf:li xml:lang="x-default">Blank Document</rdf:li>
 *                 </rdf:Alt>
 *             </dc:description>
 *             <dc:subject>
 *                 <rdf:Bag>
 *                     <rdf:li>blank</rdf:li>
 *                     <rdf:li>metadata</rdf:li>
 *                     <rdf:li>document</rdf:li>
 *                 </rdf:Bag>
 *             </dc:subject>
 *             <xmpMM:DocumentID>uuid:34535ffa-b632-43f1-b1fd-80cea6fdc351</xmpMM:DocumentID>
 *             <xmpMM:InstanceID>uuid:69ace620-4c54-407f-8d45-6eebc90f34c2</xmpMM:InstanceID>
 *             <pdf:Producer>Adobe Acrobat Pro (32-bit) 24.3.20112</pdf:Producer>
 *             <pdf:Keywords>blank; metadata; document</pdf:Keywords>
 *             <xmpRights:WebStatement>https://www.chilkatsoft.com/</xmpRights:WebStatement>
 *         </rdf:Description>
 *     </rdf:RDF>
 * </x:xmpmeta>
 */

$x_xmpmeta_xmlns_x = $xml->GetAttrValue('xmlns:x');
$x_xmpmeta_x_xmptk = $xml->GetAttrValue('x:xmptk');
$rdf_RDF_xmlns_rdf = $xml->ChilkatPath('rdf:RDF|(xmlns:rdf)');
$rdf_Description_rdf_about = $xml->ChilkatPath('rdf:RDF|rdf:Description|(rdf:about)');
$rdf_Description_xmlns_xmp = $xml->ChilkatPath('rdf:RDF|rdf:Description|(xmlns:xmp)');
$rdf_Description_xmlns_dc = $xml->ChilkatPath('rdf:RDF|rdf:Description|(xmlns:dc)');
$rdf_Description_xmlns_xmpMM = $xml->ChilkatPath('rdf:RDF|rdf:Description|(xmlns:xmpMM)');
$rdf_Description_xmlns_pdf = $xml->ChilkatPath('rdf:RDF|rdf:Description|(xmlns:pdf)');
$rdf_Description_xmlns_xmpRights = $xml->ChilkatPath('rdf:RDF|rdf:Description|(xmlns:xmpRights)');
$xmp_ModifyDate = $xml->GetChildContent('rdf:RDF|rdf:Description|xmp:ModifyDate');
$xmp_CreateDate = $xml->GetChildContent('rdf:RDF|rdf:Description|xmp:CreateDate');
$xmp_MetadataDate = $xml->GetChildContent('rdf:RDF|rdf:Description|xmp:MetadataDate');
$xmp_CreatorTool = $xml->GetChildContent('rdf:RDF|rdf:Description|xmp:CreatorTool');
$dc_format = $xml->GetChildContent('rdf:RDF|rdf:Description|dc:format');
$rdf_li_xml_lang = $xml->ChilkatPath('rdf:RDF|rdf:Description|dc:title|rdf:Alt|rdf:li|(xml:lang)');
$rdf_li = $xml->GetChildContent('rdf:RDF|rdf:Description|dc:title|rdf:Alt|rdf:li');
$rdf_li = $xml->GetChildContent('rdf:RDF|rdf:Description|dc:creator|rdf:Bag|rdf:li');
$rdf_li_xml_lang = $xml->ChilkatPath('rdf:RDF|rdf:Description|dc:description|rdf:Alt|rdf:li|(xml:lang)');
$rdf_li = $xml->GetChildContent('rdf:RDF|rdf:Description|dc:description|rdf:Alt|rdf:li');
$i = 0;
$count_i = $xml->NumChildrenHavingTag('rdf:RDF|rdf:Description|dc:subject|rdf:Bag|rdf:li');
while ($i < $count_i) {
    $xml->I = $i;
    $rdf_li = $xml->GetChildContent('rdf:RDF|rdf:Description|dc:subject|rdf:Bag|rdf:li[i]');
    $i = $i + 1;
}

$xmpMM_DocumentID = $xml->GetChildContent('rdf:RDF|rdf:Description|xmpMM:DocumentID');
$xmpMM_InstanceID = $xml->GetChildContent('rdf:RDF|rdf:Description|xmpMM:InstanceID');
$pdf_Producer = $xml->GetChildContent('rdf:RDF|rdf:Description|pdf:Producer');
$pdf_Keywords = $xml->GetChildContent('rdf:RDF|rdf:Description|pdf:Keywords');
$xmpRights_WebStatement = $xml->GetChildContent('rdf:RDF|rdf:Description|xmpRights:WebStatement');