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

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Chapter 11: Plug-in 89 - Words From Root

Whenever you can save your users a little typing then you give them yet another reason to use your website in preference to others. One neat trick is to provide a clickable list of words the user is likely to be entering.

The Figure shows the word part appl entered as part of the GET variable word, and underneath the first 20 words found in a local dictionary beginning with those letters can be seen.