I put my php files here:
xampplite/htdocs/xampp
then to access them do:
http://localhost/xampp/
that will bring up the xampp menu where you can access phpmyadmin and sql. If you just want to load php docs then if you put your file in the htdocs/xampp/ area then you type:
http://localhost/xampp/filename.php
It will load the php file then. Its best to create a folder to put your php files in such as:
http://localhost/xampp/folder/filename.php
If all you get is a page error when doing any of this you haven't started apache, go into the xampp folder click the xampp-control then click start apache, start sql. Then it will all work correctly.