I introduce the concept of db_clean() in chapter 9, which is part of a refactoring discussion on security. Originally though, in chapter 6, I wanted you to create some functionality without the extra security so that we could later go thru refactoring.

If you're going to use the code from the download (instead of typing it in by hand) then you need to grab all of the code, including the helper file that contains the db_clean() function....sorry if this is confusing.

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Thomas Myer
Author, Professional CodeIgniter
http://www.tripledogs.com