Do I need a visa to enter Hong Kong?

My wife and I want to bring our 2 children to Disneyland in Hong Kong, we will only be staying for about 3 to 5 days and we will return to the Philippines. Do we need a visa to enter just for a short visit? If we need a visa can we get one as a family , or do we need one for each person? If we need a visa would there be a fee? And can it be done online?