Doctor of Philosophy. No, you dont have to be a Philosophy major to receive this! If you break it down, philosophy simply means; Theory of Knoqledge. Therefore receiving a PhD will mean that you are a Doctor of "Theory of Knowledge" in your major. You are an expert and you know all there is to know about what you studied!
P.s; Most of the time, following receiving a PhD, many end up one of the two types of researchers. College Professors, or Lab researchers.
I have a PhD in Computer Science, I am an expert I know everything about Computers!
Woahhh, Jasmine got a PhD in Culinary Arts.. I can't believe she survived 6 whole years in college! <.> Go Jas!