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Chapter 12. Errors, Debugging, and Deployment
So far in this book, we've shown you the techniques
to build the popular components of a web database application. This
chapter shows you how to find bugs in those components and prepare
your application for deployment by adding the finishing touches that
will make it a professional web database application.The first two sections introduce PHP errors, common causes of
programming error, and how to find them. We show you examples of
error types, and explain how error reporting can be configured for
debugging while you're coding and adjusted later for
deployment. We also discuss the common sources of error in PHP, their
symptoms, and how to rectify them.The second half of this chapter discusses application deployment. We
show you how to add your own error handler that reports errors to the
user in a framework that's managed by the
application, sends errors to a log or the system administrator, and
handles custom errors you can trigger from your code.Chapter 16 through Chapter 20 present a complete, annotated online winestore
web database application. The application is built using the
techniques and components discussed in earlier chapters, and debugged
using the approaches discussed in this chapter. It includes a
full-featured custom error handler.
