I've found PHP Intelephense to be pretty indispensable in my VSCode installs - be warned though, if you use primarily docker but not the remote connection plugin and don't have php installed locally, it will throw some warning at you. Although I may be one of few people that work that way.
Another tool I came across just the other day that may be helpful is PHP CS Fixer. I could well be just terribly behind the times on it and I've not used it yet, but it does look interesting.