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The following code is not working:

$html = "<h1> WELCOME TO PHP Dompdf </h1>";

use Dompdf\Dompdf;

ob_get_clean(); // Clear Buffer - this is very important!!!

$document = new Dompdf();
$document->loadHtml($html);
//$document->setPaper('A4', 'portrait');
$document->setPaper("A4", "$orientation");
$document->render();
$document->stream("Payslips", array("Attachment"=>0));

In general, Custom Files ares used to add your own pages to your site, not to output files. If you just want to output files, you better use route actions, see viewtopic.php?t=49447.