In the following thread:
http://codeigniter.com/forums/viewthread/46261/
a problem with the Postgre driver’s insert_id() function is mentioned. The function is using pg_version which is php 5 specific. A fix is included in the message but it hasn’t been applied to CI 1.5.1 distribution (it still uses pg_version.)
This post is meant to bring up the problem again so the fix can hopefully be applied before the next CI release.
-Mythago
