PHP 5.6 and what Facebook are doing with HHVM/Hack are (in the latter case, literally) entirely new languages than PHP4 or even pre-5.3, and with the PSR commun

PHP 5.6 and what Facebook are doing with HHVM/Hack are (in the latter case, literally) entirely new languages than PHP4 or even pre-5.3, and with the PSR community standards body, Composer/Packagist and the massive amounts of interoperation between libraries nowadays, it's actually enjoyable to code in again :)