The most Foreign can stay by arrival stamp in the Philippines for 30 day's - but those who wish to stay longer are required to apply for an Extension or appropriate Visa. Extension are practically possible. As from second Extension the Applicant (Tourist) can apply for a period of 59 day's. Currently (DEC 2019) 157 Countries permitted enter the Philippines without a Visa for an initial 30-days.
The Alien Certificate of Registration Card (ACR Card) will get after second Extension.