Just to try to clarify about the nature of philosphy:
My philosophy Teacher says that philosophy, originally, was the term used to nominate all the sciences (from logic, to biology to astrology, etc.), but when a science became too complex it "separated" from the philosophy and because of this, today philosophy only works with some "sciences", and other have their own methods and fields.
About logic, according to my teacher, it is one of the "chapters" or "sciences" that are part of philosophy, but, in itself, logic is not the only basis of philosopy, only one of ist fields of study and, freq�ently, one of its "tools".
So, when on says that philosophy is entirely based in logic he is exagerating, while is truth that logic is one of the most popular "tools" of philosophy, and that philosophy have an entire "chapter" of studies about pure logic, it is not the "essence" of philosophy, that, in itself, is a "colective" of sciences.
I hope this helps to clarify the question, and if i'm wrong, it will not be the first time
Makinus