DevShed has posted the fourth part in their introduction to the CodeIgniter framework. This time they focus on form validation.

If you're a web developer, you've probably written any number of scripts designed to validate the input entered into a web form. More than likely, then, you'd like something that will make that job easier. Enter the Code Igniter PHP framework. In this fourth part of a nine-part series on this framework, you'll learn how to use it to do basic validation on a web form.

Making and validating forms in CodeIgniter is a pretty simple process thanks to the built-in validation features of the framework. They show you how to create a form and how to implement the validation and output error messages when an issue comes up.