Since I don't know where the "install-pear-nozlib.phar" was originally, and therefore can't move it back, do I assume that I don't need to worry as it's already done whatever it needed to do?
It came from /usr/php/ and I suspect it is still there as you would not have had permission to move it.
In any case, it is something you will almost certainly never use and is not at all involved in the operation of your Mac.
