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

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Chapter 9: Plug-in 64 - Sanitize String & MySQL Sanitize String

When accepting user input for redisplay, and particularly if it will be inserted into a database, it's important that you sanitize the input to remove any malicious attempts at hijacking your server, or otherwise injecting unwanted MySQL commands, HTML or JavaScript.

The Figure shows each of the plug-ins in this section being used to sanitize a string.