I have visted many colleges' website, and i didnt see a word "full
time" MBA required for PhD. As every college has its own eleigibility
criteria for admissio to PhD, you need to check up with your college
of interest whether they offer admssion to dist. learning PGDBAs.
however, there are few college who offer admission to PhD prgrms even
after B.Tech./ B.E. and at least two years of work experience.
e.g.SJMSOM, Mumbai.
Pl refer the following link for the list of colleges offering PhD
(includes their URLs too)
http://www.indiabschools.com/doc_prog.htm
brgrds,
kamal