I've been working with PHP 7, it's pretty impressive so far, I really love the type hinting / pseudo-static typing -- it's something I've wanted for PHP for over a decade. There are missing extensions which haven't been ported and most importantly, xdebug, doesn't look like it'll be ported for a while, as on github I noticed the primary contributors were complaining that it'd be "too hard" to do it. In the mean time I created a drop in replacement which works somewhat OK:

http://tonyshowoff.com/articles/php-7-replacement-for-xdebug-tracing/

Code is under MIT/X11, because unlike Stallman, I don't believe in forcing you to let me see your code, in other words, I've showed you mine, you need not show me yours 😉