Question

I am using simple_html_dom to parse a website.
Is there a way to extract the doctype?

Answer 1

You can use file_get_contents function to get all HTML data from website.
For example

<?php
   $html = file_get_contents("http://google.com");
   $html = str_replace("\n","",$html);
   $get_doctype = preg_match_all("/(<!DOCTYPE.+\">)<html/i",$html,$matches);
   $doctype = $matches[1][0];
?>