WebReference.com has posted the fourth part of their series on user personalization. This article focuses on the registration page for their sample application.

In this article we look at the registration script for our bookmark system. The script is basically responsible for admitting new users to our system. As you will see, it sets certain requirements that a new user must meet before they are admitted and also implements some data checking for security purposes, since it is going to receive a lot of 'outside' data that it needs to incorporate into the application.

The script takes in a username, password, email address and optional values for an image and a personalized color scheme. Some simple validation is done and escaping on the strings before they're put into the MySQL database. They also briefly mention some error handling that can be done by logging issues to the web server's error log.