visiting hongkong for 4-5 days, do we still need to get China visa?

I am currently working here in Singapore but I want to visit Hong Kong when my leave is granted. I would like to go there together with my family who is in the Philippines-we may be 4-5 people. We plan to stay there for 4-5 days. Do we still need to get visa? What are the requisites? As for me, may I get the visa here in Singapore or should I Just process it in the Philippines? Thank You.