What is the point of finding your absolute path? If you're using PHP Includes and you want it to include in a page in a separate directory, then you'll need to find your absolute path. You can also find the directory you're currently in or wishing to get to.
Your absolute path should be something like this :
/home/user/public_html/index.php
Copy and paste this code into a blank page :
Remove the spaces between < ? and ? >.
Save it as absolutepath.php
Go to yoururl.com/absolutepath.php
It should show you absolute path on the screen.