TWOV is available to citizens of the Philippines, but is limited to 24 hours at all Chinese airports, as measured from scheduled arrival to scheduled departure. Either one or two in-China transit airports are allowed, but total is always 24 hours. You may leave the airport if your time permits. Flying out the Phils, your airline may or may not give you a hassle before allowing boarding, so have some documentation handy. Chinese Immigration on arrival will not be a problem if you have a conforming transit.