Get the form online to fill-up and prepare requirements listed in the application form or in
Photocopy personal particulars of your passport and IC, E-Pass, S-Pass or Workpass front and back because the nearest Photocopying machine in Philippine Embassy is in Tanglin Mall.
If you plan to take an id picture in the embassy itself then prepare small bills like S$2 or coins. Inside there's a Self-Serve Photobooth. You don't need to cut the pictures. During submission they will do it for you.
Bring some reading materials, refreshments, fan, pen, paste and scissors just in case. If you came in late then you better prepare for a long wait. Make sure you get a queue number right away.
In the claim stub it indicates the date and time for you to come back. Bring your old passport, IC, S$85 and claim stub. Give the claim stub in Window <> and wait for your name to be called. Once called double-check the details of your new passport and your done.
If you are a PR then you need to login to www.ica.gov.sg using your Singpass to update your Re-Entry Permit (REP) of your new Passport Number. Once you updated it you can print your new REP already and wait for 14 days for the approval letter to be received.
Disclaimer: This may not be the latest procedures or requirements. Refer to related government agencies.