In part two of their "Object Interaction" series, DevShed builds on part one diving a bit more into the techinical side of the aggregation.

In the first part of this series, we've taken a look at one of the most powerful processes involved within object interaction in PHP: Aggregation.

In this second part of his series, Alejandro Gervasio gets a little more technical with the basics of Aggregation. He begins working with a MySQL abstraction class and a useful paging class, and is starting to get into writing portable code and introducing the technique of aggregation.

They build on the MySQLConnnector class that they started in the first part, adding row-counting methods and showing how to use it to its fullest extent.