Some notes from Facebook's UStream event this evening: <a href="http://www.recessframework.org/page/notes-from-facebooks-hiphop-for-php-debut" rel="nofollow">http://www.recessframework.org/page/notes-from-facebooks-hip...</a><p>High points:<p>the performance numbers were against PHP <i>with APC op-code caching enabled</i><p>eval, create_function, and preg_replace with /e (basically eval), and conditional flow based on the existance of functions are the only features not supported.<p>Currently PHP5.2 with a roadmap of 5.2.12 compliant in the next month and 5.3 being the focus after that.