The large majority of tourists are able to obtain a 30 day visa upon arrival in the Philippines. This can usually be extended for a fee (approximately 60 Euros).Your passport is required to be valid for at least six months from the date of arrival in the Philippines.
Click here to visit The official Philippines Bureau of Immigration.
Follow this link for a somewhat more simple explanation of the Philippines Visa Policy
If you are at all unsure of the visa situation, you should contact your nearest Philippine Embassy.