I have to say that I was pleasantly surprised by some of the new language features that php has borrowed from elsewhere... eg: closures, anonymous functions, docstrings.
IMHO php is held back primarily by messy, inconsistent documentation and extremely ugly parts of the core library that are also riddled with inconsistencies that should have been deprecated years ago.
Not that I would consider starting a new project in php - I just love programming too much for that; but I believe php will evolve, benefiting from other languages.
Really, it needs it's own "Python 3" (out with the old, smarten up the new).