HTML, Chapter 1: Introducing PHP and XML, Introducing DOM, Chapter 4: Understanding Extensible Stylesheet Language for Transformation, Chapter 8: Working with Databases using PHP and XML, Appendix G: PHP and Extensible Stylesheet Language for Transformation
HTTP, Chapter 6: PHP and XML-Remote Procedure Calls, Understanding WDDX, Appendix D: XML-RPC for PHP
HTTP-POST, Introducing RPC
HTTPS, Appendix D: XML-RPC for PHP
Hypertext Markup Language, Appendix G: PHP and Extensible Stylesheet Language for Transformation
Hypertext Pre-Processor, Chapter 7: PHP and Web Distributed Data Exchange
Hypertext Preprocessor, Chapter 2: PHP and Simple Application Programming Interface for XML, Chapter 5: PHP and XPath, Appendix G: PHP and Extensible Stylesheet Language for Transformation