Does Adobe Campaign server support PHP?
If so, where should one upload the PHP files to?
Thanks in advance.
There are some PHP wrappers for Experience Cloud APIs that people have built. The other option is to build your own wrapper for PHP using SOAP to implement the native APIs
Adobe Campaign doesn't, but part of installation is to front it with Apache or IIS for connection handling.
Install PHP modules to whichever's in use and you'll be fine.
If you want to make use of Adobe Campaign java bindings you'll have to use JSP.