Thread:Project:Support desk/How to use php ? Or how can i write in all pages

Hi, I use PHP 5.3, Mediawiki v1.18 and MySQL v5.5. I want to put a php form question in ALL pages and i don't know how to right it - insert a php code. Do you know how I can do this ? I thought in the php file that create all wiki's page but I don't find it ...

Thank's for answering!

AnreW