(Yes, you are allowed to enter Hong Kong or Macau. You don't need a visa to Hong Kong or Macau, therefore, your passport doesn't need to be valid for at least 6 months. A passport with one month validity beyond the stay duration in HK/Macau is accepted, which means that your passport still has at least 1 month validity when you exit HK/Macau)

Hi. Regarding the reply above by Mrs. Jade. Will there be no problem with the immigration in Philippines?
I've heard from Cebu Pacific Airline that they will only allow passengers with 6months passport validity regardless of visa exemption. Is this a prerogative of the airline as well? I'd like to try other airline in that case. PAL, perhaps.