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Chapter 9. Validation with PHP and JavaScript
Validation
is essential to web database applications. In this chapter, we begin
by discussing the types of validation that can be implemented in a
web database application, and then show you how to validate data at
the server using PHP and at the client using JavaScript.This chapter extends our discussion of validation in PHP. We have
already introduced basic security validation and empty field checks
in Chapter 6. We continue here by introducing
the principles of validation and the practice of validating form
variables and values with PHP. We show you how to validate strings,
numbers, dates, times, and Internet addresses, and how some of these
tasks can be simplified using PEAR packages.This chapter also introduces client-side JavaScript. We compare it to
PHP and show you the basic techniques used in most common
applications. We then describe how simple validation can be performed
at the client to save network costs and improve responsiveness of an
application to the user. We also introduce other simple tasks that
can be effectively accomplished with JavaScript.This chapter is about user data and helping users to meet system
requirements. Parse errors, database server failures, debugging code,
and other PHP and database server problems are the subject of Chapter 12.
