The challenge is to wrap given words in text content with a span and add a class to the span depending on the word. Do not touch elements, attributes, comments or processing instructions. Do it case insensitive and do it the safe way.

He uses the FluentDOM tool to get the job done. It allows him to create an XPath expression to single out the item to be highlighted (in this case a single or series of words) and wrap them in a matching span tag with the correct styles attached.

Today I like to present a new projekt: FluentDOM. It provides an easy to use, jQuery like, fluent interface for DOMDocument. The idea was born in a workshop of Tobias Schlitt about the PHP XML extensions at the IPC Spring in Berlin.

He includes a basic code example - locating items with an ID of "first" and removing that ID to replace it with a class. If you'd like to check it out (literally) you can grab the latest version from the project's public svn.