Nima, what "PHP files" are you referring to exactly? Now that you've
installed AOLserver's PHP support, what PHP application are you trying
to use with it?
Sounds like what you want is a single integrated log-in across your
OpenACS and PHP applications, but I don't think anyone's going to be
able to help very much unless you tell us what those PHP applications
are, how they (or if) they are currently attempting to do their own
stand-alone login/authentication, etc.
On the other hand, if PHP application isn't trying to do much of
anything with login or authentication on its own, then probably all
you really want is to force an OpenACS login whenever the client
requests certain classes of URLs. You should be able to do that with
an AOLserver registered filter on all those URLs calling
ad_maybe_redirect_for_registration
or some similar OpenACS login proc. There might be a better way,
perhaps by fiddling with the request processor, but the registered
filter route should work.