I also keep my distance from PHP. :) Although I know very few about it, and have programmed in it in the past, I prefer GNU Artanis, because it allows me to use Guile Scheme for doing sites, for which I'm getting familiar with, although I didn't make any website yet.
Also, various researches show that Guile Scheme is better for server-side scripting because there is little drawback from loops. One comparison can be seen by viewing the info page for GNU Serveez (which is a multi-purpose server-creation-and-usage framework, which also happens to provide an http server for use, although GNU Artanis is more actively maintained (and perhaps more customizable? I don't know for sure), but GNU Serveez is more easy to setup in my opinion).
