How can constants be defined once and reused through all files?

Question

I\'m trying to set up a site that has many reusable headers/footers, style information, etc. Is there anyway to define a global constant/function that can be reused from any

Answer 1

In your header, declare a variable with the root information. Your path to include the header will have to be correct, but from there on out you can use include(MY_ROOT . 'filename.php');