Just a short note again on HandlerSocket developments: PHP bindings to the HandlerSocket client library have been spotted in the wild: https://code.google.com/p/php-handlersocket/ (I'd like to credit someone, but I have no idea who user "avuenta" is on Google Code. Is it you Dathan?)
I found this on Dathan Vance Pattishall's blog. I haven't personally had time to try it out yet as I'm still deep into my current project (of which I hope to blog in January).
"...php-handlersocket which is a PECL type version (C driver with exposure to PHP). It does the job but needs some work that I'm doing now."