I would like to become self-sufficient, and therefore do without services such as DNSDynamic and DYNDNS. And I don't like paying for services that I could do myself.

So here's the scenario - I have my main website hosted with a hosting company. I also have a home server with my music, etc. on it. But the problem is that my ISP (BT) does not offer consumers Static IP addresses.

I would like to have a subdomain of my main domain (which points to my main host) point to my home IP. This is done with a simple A record - which I have done myself.

This boils down to me wanting to make a PHP script (run by a cron job on my home server) to update the A records in cPanel to the current IP of my home server.

Here's some sample code - of course the bit that's missing is the API Code to communicate with cPanel, and I'd be very thankful to anyone who could fill in the gaps for me.