I am working on installing PHP for multiple Apache 2 instances on a Windows NT server. The idea here is to have a developers instance, a QA instance, the training instance, and then the pre-production load instance.

In the PHP.ini file you have to define a doc_root. But with each of these instances we will have a different doc_root. This is the only point that I am unclear on. Can I define more than one PHP.ini file or is there someway to tell php w/in the php.ini file which doc_root is which?