php-mode is quite a glaring omission from the official emacs distribution, but emacs itself being managed by FSF/RMS himself he's quite picky about licensing.

php-mode is quite a glaring omission from the official emacs distribution, but emacs itself being managed by FSF/RMS himself he's quite picky about licensing. That being said, on debian/ubuntu, php mode is "php-elisp" as an official package that you can install system-wide.