The article is completely unsubstantiated.<p><i>Well, I was able to put all the pieces together on this one, finally, and I now understand exactly what is up: Facebook has rewritten the PHP runtime from scratch.</i><p>Look if it's true, this is cool, it will no doubt be a great contribution to the OS world, but let's wait until Tuesday or until we have more concrete info beyond this author's guess that FB has completely rewritten the PHP runtime. I realize the author has little to gain from making this up, except for maybe 15 min of fame on HN, but still, don't believe everything you read.