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

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Chapter 7: Plug-in 47 - Page Updated?

If you want to allow your users to be notified whenever one of your pages is updated, or perhaps you would like to be informed when a web page that interests you has been changed, then all you need is this plug-in.

The Figure shows the index page at pluginphp.com being monitored for changes.