Can I apply for a Philippine green card online?

You can't. The Philippine green card can only be processed at the embassy, so it cannot be processed online. A green card, that is, a permanent residence permit for foreigners, is a permanent residence permit for foreign citizens. Holding a green card means that the cardholder has the permanent residence in the issuing country, and at the same time, holding a green card can exempt entry visas for a certain period of time.