A McGraw Hill Book Plug-in PHP: 100 Power Solutions
By Robin Nixon (McGraw Hill 2010, ISBN 978-0071666596)

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Chapter 8: Plug-in 52 - Post to Guest Book

No self-respecting website is complete without some means of providing feedback, so here's a simple plug-in to enable you to offer a Guestbook feature in just a few lines of PHP code.

The Figure shows the same information posted twice but, because flooding control is enabled, the second post is not added to the Guestbook.