3: Security and Authorization (Chapter 8).

4: A user registration example (Chapter 12).

5: An e-commerce example (Chapter 13).

6: Generate HTML formatted email messages.

9: Using PayPal with your site.

10: Attach a file to an HTML email.

12: Using .htaccess to convert generic URLs to actual URLs.

16: Construct Chained Menus Automatically.

18: Dealing with unicode.

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