IBM has provided a public draft of the Redbook I wrote with a team of specialists in San Jose earlier this year. The book is undergoing a final editorial process to fix grammar, spelling and layout issues and to incorporate input from technical reviewers.
Please give it a read and pass your comments on to the editors via the feedback link on that page.
The draft includes infromation on developing real-world applications with PHP and DB2/Informix IDS/Cloudscape with various database interfaces (including PDO and ibm_db2). It also has installation instructions for setting up the IBM data servers with Apache and the Zend Core/Studio software.