You're right about register_globals. However, the others require users to actually read the documentation, which unfortunately many do not. A new user of PHP r

You're right about register_globals. However, the others require users to actually read the documentation, which unfortunately many do not. A new user of PHP reading a tutorial does not necessarily know these functions are unsafe. They type the functions into their program and they still work, even on the latest versions of PHP. They don't see a visible deprecation warning on the page.