The most common use for PHP is building web sites. PHP makes web applications dynamic, enabling users to interact with the site. The web application collects information from the user by means of HTML forms and processes it. Some of the information collected from users and stored at the web site is sensitive information, making security a major issue. PHP provides features that enable you to collect information from the user and to secure the information. It's up to you to develop a complete application using the pieces provided by PHP. This chapter describes how to use the functionality of PHP to build a dynamic web application.
After you finish reading this chapter, you will have learned