DOMPDF: Unable to stream pdf: headers already sent

Question

This question has been raised hundred of times in various fora; some have been solved, some not. I checked plenty of resources, but my issue could not be resolved. I am gene

Answer 1

Replace line 3105 of this file: dompdf/lib/class.pdf.php

if ( headers_sent()) {
  die("Unable to stream pdf: headers already sent");
}

With

$output = ob_get_clean();
if ( headers_sent()) {
    echo $output; }

Then in the file that is generating the pdf output e.g if you were outputting from a Joomla Component components/com_joomlacomponent/views/yourpdfdir/tmpl/default.php Enter immediately after the opening php tag