XAMPP usually stores the web-accessible files in an htdocs folder. Find this and prepend http://localhost/ where local/path/to/htdocs would be, and if XAMPP is running, it should work.
So a file (in Windows) named and found in c:\xampp\htdocs\test.php would be http://localhost/test.php.
See: http://www.apachefriends.org/en/faq-xampp-windows.html#startpage
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solved XAMPP won’t run php [closed]