PHP - Site Index Variable?

I want to a script to send information on to a page in the site index that's in a directory. Example:

http://www.example.com/forms/applyform.php

The person fills out the form and hits submit. I want the form to submit to
http://www.example.com/formvalidation.php

Isn't there like a pre-defined variable in php like $_SERVER to get the site's index?

I'll save you a lot of time when you need some help ...

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