For those that aren’t familiar, a NAS (Network Attached Storage) is a big honking hard drive sitting on GigE port that typically runs a Linux distro and is intended for sharing files, backing up computers and a host of other things. MS makes a similar OS that HP uses for their SOHO shared server disks. At any rate, to answer your question, I think you’d have to Google a bit to figure out how to get a newer version of PHP with PDO installed on your NAS OS build. It doesn’t seem to be trivial, but it certainly seems possible if you put on your sysadmin hat:
http://forum.synology.com/enu/viewtopic.php?f=3&t=3548