How to use relative paths for included files such as .css

Question

I have a header.php file which contains a .css file link.

When I \"include\" header.php into another php file in different fo

Answer 1

Based on Tom's answer I did a combination of base url and a PHP define (for less typing).

Somewhere in PHP:

define("HOST_BASE", "http://example.com/");

Then in the header file:

The base tag was new to me and I was worried about compatibility, but it appears to work well. There is more info about it at MDN.