Save PDF file on server and display in users browser:

$file_to_save = '/home/stsnew/public_html/pdf/file.pdf';
//save the pdf file on the server
file_put_contents($file_to_save, $dompdf->output()); 
//print the pdf file to the screen for saving
header('Content-type: application/pdf');
header('Content-Disposition: inline; filename="file.pdf"');
header('Content-Transfer-Encoding: binary');
header('Content-Length: ' . filesize($file_to_save));
header('Accept-Ranges: bytes');
readfile($file_to_save);