Coding is more of a hobby for me, although I do utilize PHP for utility scripts (personally and at work).
Just recently, I needed to be able to parallelize operations to speed things up for one such utility script for work. Given that I'm not a professional programmer, I didn't have any experience with process forking.
I found your class, and because of it's ease of use, I was able to de-serialize my script, which considerably sped up processing (from about 40 minutes on a run down to about 4-5). I can't say enough great things about this class and how it made forking processes a breeze (as well as how easy it was to dole out the data to the processes)!