i plan to visit macau this coming Feb28 with only one way ticket?do they allow me to enter?

Why don't you buy the return flight tickets? Maybe the Macau immigration will refuse you to enter Macau because you just hold a one way ticket. Philipinnes nationals are exempt from a visa to Macau for up to 30 days, maybe you will be issued a 30 days Entry Permit.

Philippine Citizens and other nationalities must provide round trip air tickets in Entering foreign country, unless individuals have obtained permanent residency status and/or have obtain Re-Entry permits which allows those people to enter the country with 1 way ticket.