Apache/PHP Output Filter Module

Require to Develop a Prototype Apache Output Filter Module and or a PHP Output Filter Module for Post Processing of Html Content. The Prototype Code should demonstrate changing of the Title Tag of a Html Document. The coding should be very modular to cater for enhancement to do extensive Post Processing of Html Content. Proper documentation to be provider for setting up the environment/testing and further enhancement to the Output Filter Module. I am basically a expert .NET C# developer and am slightly familiar with Php/Apache. I am looking for some one who clearly has experience in this and not someone who will read the documentation/manual and implement it which i can also do it, but it will take time. That is why it is a prototype and the requirement is similiar to a Hello World type of application.