In a pointer from this post on Nexen.net today, there's a look at a new post on Ernies Weblog concerning the use of multiple versions of PHP with Apache on Windows.

I had occasion to set up a dev box to test a couple of web apps against different php versions, so I thought I would share the steps. I have documented for 2 versions, but more can be done if required. This was done using Apache2 on Windows.

His process involves the installation of Apache first, then each of the PHP versions in seperate locations (to keep things clean). From there's it's a matter of creating two different services, one for each version og PHP. Then, whenever you need it, you can just fire up the appropriate version...