From a presentation of Minnesota PHP User Group ( mnphp.org ) at The Nerdery on May 3rd, 2012. To learn more about upcoming user groups and events at The Nerdery, check out nerdery.com/events.
"PHP isn't multi threaded :( Fear not, there are still some very good ways to distribute your background work 'web scale' across an unlimited number of servers with very little setup.
We can discuss RabbitMQ and an environment with Event Polling / Queued Jobs / Job Locking / Job Queue Strategies / Caveats to job queues."
(Mandatory Disclaimer: The views expressed in user group videos do not necessarily reflect those of The Nerdery.)