First you need to ask yourself how much money do you need for a month stay?
I forgot how much is the max before you need to declare it when you bring money out but I know US$3000 per person was good, for that was how much I brought with me. (Thinking $100 a day was enough).
So me & my family went there for a month last year we brought enough US dollars which we ended up exchanging where ever we went, mostly in major malls & shopping centers. The rates change almost from day to day so if the exchange rate is going up it is wise to exchange day to day, if it is falling down obviously you would want to exchange more before it goes down the next day.
My sister-in-law withdrew cash (pesos) from ATMs over there from her $ account abroad, so you may want to ask your bank about that, of course there is a maximum amount to withdraw and fees to pay per withdrawal.
I also called my bank & advised them that I was travelling to the Philippines at those days & might use my credit card there. I ended not using my card but I know when I did there was a fee to be paid as well, depending on your bank & on the establishment you went to in the Philippines. I do not have an idea how much but it's not going to be that substantial.
Any bank transfers you may want to talk to the bank manager of your bank.