I've got a small web server set up that I use for random things. But the thing is, my IP changes randomly because the server is run from my home and the cable company changes customers' IP every so often. So every link I made is now broken as it's trying to find my old IP.

I found a small solution by using:

$_SERVER['HTTP_HOST'];

which gives me my ip address (ie: 127.0.0.1) and i simply put it into a link tag. But it's not working for my main folder, only sub folders.

ie: works for http://127.0.0.1/blog.index.php

but not for http://127.0.0.1/index.php

Is there any code that I can use that will display the domain name or ip address no matter what sub folder im in?

The full path name is returned with

$_SERVER['DOCUMENT_ROOT'];

Your current server IP is returned with

$_SERVER['SERVER_ADDR'];

If you design using relative links you wouldn't have this problem.

Anyway, try $_SERVER['SERVER_ADDR'] instead of HTTP_HOST.

http://127.0.0.1/index.php

This should work, may be some other reason. You your web server access log to see what it says when you access this main page.

$_SERVER['SERVER_ADDR'] would work for you.

It would be better to keep all links relative and include a file with the ip or dns variable in.

Have you tried dyndns? It might suit you.

https://www.dyndns.com/