This is somewhat a followup to "About password_hash() in PHP and storing (part of) its salt outside DB".
Is there a way or any advantage to have a system-wide salt and a user-specific salt vs just a user specific salt? If so, how can I archieve that with that function? Is there a way to replace its internal salt generator with something as secure or more secure than it and then only store the user portion of the salt in the user table?
If the system salt is used, it will be stored in a different place in a specific server.