dompdf is not able to generate a pdf from a page of my website. However, I\'ve saved the page and uploaded it as simple static html file, and it worked!
So, I don\'t
DOMPDF is trying all kinds of stuff/eval's when running local, you're better of trying:
1) the (granted, long way trip) of requesting the HTML by http:
$dompdf->load_html_file('http://yourdomain.ext/'.$file);
2) Don't let DOMPDF eval
but use output buffering itself, and let DOMPDF load the resulting string of HTML.
<?php
ob_start();
//be sure this file exists, and works outside of web context etc.)
require("admin/store/orders/45/invoice/print");
$dompdf = new DOMPDF();
$dompdf->load_html(ob_get_clean());
$dompdf->render();
?>