How to make a visa with a sponsorship from another country ?

My bf is from Reunion Island, he's going to China for an internship and he wants me to go with him. I'm from Philippines, he will sponsor all the expenses including tickets, financial statement, hotel, like literally all. I've been searching how to make a visa about my sitch but I just can't find any. If you could just tell me how to, it will be a big help for us.