PROBLEM with Header.php

[Forget!]

I have one question
why I cant use php code

<?php include 'header.php'; ?>

its show me

Warning: include() [function.include]: Failed opening 'header.php' for inclusion (include_path='.;C:\xampp\php\PEAR') in

[ihatehacks]

Because that isn't how its done.

Go use google since it's more helpful.