// reference the Dompdf namespace
use Dompdf\Dompdf;
use Dompdf\Options;
// instantiate and use the dompdf class
$options = new Options();
$options->set('defaultFont', 'OpenSans');
$options->set('rootDir',"/path/goes/here/dompdf/dompdf");
$options->set('tempDir',"/path/goes/here/tmpdir/");
$options->set('isHtml5ParserEnabled', true);
$options->set('isPhpEnabled', true);
$options->set('isRemoteEnabled', true);
$options->set('isJavascriptEnabled',true);
$options->set('isFontSubsettingEnabled',true);
$dompdf = new Dompdf($options);
/* // or could do it this way.
$dompdf->set_option('isHtml5ParserEnabled', true);
$dompdf->set_option('isPhpEnabled', true);
$dompdf->set_option('isRemoteEnabled', true);
$dompdf->set_option('isJavascriptEnabled',true);
$dompdf->set_option('isFontSubsettingEnabled',true);
//$dompdf->set_option('debugCss',true);
$dompdf->set_option('rootDir',"/path/goes/here/fontcache/");
$dompdf->set_option('tmpDir',"/path/goes/here/tmpdir/");
*/