It`s not a certainty but you may have broken the terms of your R.P visa by being away too long..
Even if they accept that it`s still valid on your return there will be fines to pay for the years you failed to report.
If you still have a valid ACR card to show the airlines however,I cant see you having any issues with onward ticket issues as you are exempt. (unless they argue that you have invalidated your visa)

10. Who are exempt from the “six-month passport validity” rule?


  1. Philippine passport holders;
  2. Former Filipinos and their dependents (immediate family members);
  3. Permanent residents and holders of other special visa categories requiring temporary residents (with valid ACR I-Cards);

http://www.immigration.gov.ph/faqs/travel-req