symfony/symfony — pull request #12994 by jeremylivingston (2014-12-15 18:26:34+00:00)
Title: Add LegacyPdoSessionHandler class

Addresses #12833.

The changes made to the PdoSessionHandler in 2.6 introduced a
backwards-compatability break for users upgrading from 2.5. This update
introduces a LegacyPdoSessionHandler class that uses the old service's
functionality.

Users who cannot make schema updates or do not want to lose sessions can
use LegacyPdoSessionHandler until 3.0.