Should be just this:
git pull
Run it while in the main phpvms directory where the .git file is. If you've made changes to the original version that won't work instead use this...
git stash
git pull --rebase
git stash apply
I like this: http://rogerdudler.github.io/git-guide/
Git will override any code on there. Be ready to handle merge conflicts - Those are always fun.