<?php require __DIR__ . '/vendor/autoload.php'; $html2pdf = new Html2Pdf(); ob_start(); // include(__DIR__ . '/content.php'); ?> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <h1>Hello</h1> </body> </html> <?php $html_code = ob_get_clean(); $html2pdf->writeHTML($html_code); $html2pdf->output(); ?>