Check for Collection
Checks whether a PDF document is a Collection (aka PDF Portfolio or PDF Package).
PHP
<?php
use setasign\SetaPDF2\Core\Document;
// load and register the autoload function
require_once '../../../../../bootstrap.php';
// prepare some files
$files = [
$assetsDirectory . '/pdfs/tektown/products/All.pdf',
$assetsDirectory . '/pdfs/tektown/products/All-Collection.pdf',
$assetsDirectory . '/pdfs/tektown/products/All-Portfolio.pdf',
];
$path = displayFiles($files);
// create a document
$document = Document::loadByFilename($path);
$catalog = $document->getCatalog();
$dictionary = $catalog->getDictionary();
if ($dictionary && $dictionary->offsetExists('Collection')) {
echo 'This document IS a portable collection.';
} else {
echo 'This document is NOT a portable collection.';
}