PHP 5.3 full-blown ActiveRecord

[eluser]vlad_ci[/eluser]
http://www.doctrine-project.org/

Doctrine is probably the most complete and sophisticated (and therefore long-time to learn and has performance penalty) ORM system for PHP

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Doctrine is an object relational mapper (ORM) for PHP 5.2.3+ that sits on top of a powerful database abstraction layer (DBAL). One of its key features is the option to write database queries in a proprietary object oriented SQL dialect called Doctrine Query Language (DQL), inspired by Hibernates HQL. This provides developers with a powerful alternative to SQL that maintains flexibility without requiring unnecessary code duplication.
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Since all of my tables sofar have one primary key and they reside in different database instances (I use database sharding extensively)
most of the ORMs do not work for me, so I have my own primitive one to just generate 'strings' representing SQL statements for PDO
functions.