Upvote:3
According to the Phillipine Consulate in Australia:
No permit is required from the Bangko Sentral ng Pilipinas to bring in to or to take out from the Philippines of foreign currencies. However, foreign currency in excess of US$10,000 carried by the traveler must be declared at the Bureau of Customs Desk in the airport.
Therefore the answer to your question is: you can import as much cash as you want (in foreign currencies), but amounts over 10000USD
must be declared.
"Forreign currencies" include all currencies except the Phillippine peso.