It is easy, really.
I went to the Capitol and all I had..
Passport
Cerificate of no impediment
Birth certificate
Decree Absolute
Decree Nisi (just in case)
8000 pesos fee, in cash
Bingo!!!
10 days later you can get hitched.
The only problem is the queue outside.. you will have to wait your turn.
We were extremely lucky, as we were taken around the back door.
Anyway the lady clerk that helped us, received a huge box of Ferrero Rocher.
Good luck
Dom
http://www.gov.ph/faqs/marriage.asp
If you look at the link, it is self-explanatory