Igbinary is a drop in replacement for the standard PHP serializer.
Instead of time and space consuming textual representation, igbinary
stores PHP data structures in a compact binary form. Savings are
significant when using memcached or similar memory based storages for
serialized data.

This port supports sessions, a feature that is only available when the
session module is statically compiled into PHP. This port patch igbinary
to use the dynamically compiled session module.