Also, PHP 5 has been unmaintained for years. It’s reckless to run it on a distro that doesn’t have a maintained package of it (that’s only CentOS/RHEL 7 at this point). If you must have it for some old software that you can’t update for some reason, I’d recommend you isolate that one app on its own server with no other users or data (and run CentOS or RHEL 7 so you have a maintained PHP5 package).