Structured data storage (as, for example, PHP sessions), on key / value storage server (memcached, redis, ...) or simply in flat file is an impoortant need.

With PHP, we have various serializers, the PHP standard one, serialize, the JSON one, json_encode, the igbinary one, igbinary_serialize and, from now,  this new one, msgpack_serialize.

This new extension is still considered as experimental (beta version).

Installation, on Fedora or Enterprise Linux with php 5.3

yum --enablerepo=remi install php-pecl-msgpack

on Enterprise Linux with php 5.4

yum --enablerepo=remi,remi-test install php-pecl-msgpack

So, you can test it now.

According to tests, feedback, and its interest, I will consider to propose this new package for the official repository.