emacs mode for php + html + js

Hello Emacs experts,

I'm currently using emacs with elpa-php-mode
and I have some problems with indentation and performance.

Maybe I'm underestimating the problem
but I'd like to have a custom mode that just adds a space when the previous line finishes with a certain tag / character
and removes a space when it's closing a tag / certain character.

You will be able to publish the emacs mode if you want, so others can benefit.