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

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Chapter 3: Plug-in 2 - Caps Control

When dealing with user input you will often come across people who keep their Caps Lock key permanently enabled, which can make reading what they write difficult on the eye. It also looks like they are shouting. To diminish or entirely remove this problem you can use this plug-in, which also supports three other upper and lower case text transformations.

The Figure shows these four transformations applied to a poem by Lewis Carroll.