I finally formalized, cleaned up, and packaged up my current emacs editing setup for files with intermixed PHP, HTML, JS/javascript, and CSS code all in the same file. It uses an existing but rarely used technique called “multi-mode” and sets “trigger points” for switching the “major mode” of the buffer as your cursor moves through the code.
A nice thing about this approach is that you can always glance down anytime you are editing to see which mode you are in (or the emacs lisp code thinks you are in). You can also fork/edit the single “.el” lisp file to add/update the triggers for various modes.
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