DoH (DNS over HTTPS) PHP Client

This is a proof of concept for a DoH (DNS over HTTPS) client in PHP. It is based on the latest draft https://tools.ietf.org/html/draft-ietf-doh-dns-over-https-03 and supports the GET method with the DNS UDP wire format. This is a work in progress and only the A, AAAA and CNAME records are supported.

MX and NS are coming soon.

It supports CloudFlare's , Google's and CleanBrowsing DoH servers.

This tool should be executed from the command line and it has a similar output as the host command. Example:

 $ php doh-php-client.php 
 Usage: doh-php-client.php [server:cloudflare,google,cleanbrowsing] [domain.com] <type: A, AAAA or CNAME>
 $php doh-php-client.php cloudflare github.com
 github.com has address 192.30.255.113
 github.com has address 192.30.255.112

Or for IPv6:

 $ php doh-php-client.php google sucuri.net AAAA
 sucuri.net has IPv6 address 2a02:fe80:1010::16

You have to specify as the first argument which DoH server to use. We support "google", "cloudflare" or "cleanbrowsing".

This is just an initial test version. We will be spliting it into a better organized package later.