shifting to PHP

I am new to PHP but i am good at ASP(working on it since past 3yrs) since ASP has limitations likeit has to use external com components to do even file uploading,graphs etc. I want to shift(Learn) PHP so i can be able to program beyond windows platform. i had downloaded PHP4.2.0 from php.net.I want u to help me in how to go about programming in PHP. Guide me step by step like giving books to be refered pl suggest if any PDF are available. and also i wats to know whether PHP code is compiled or interpreted. I also wants to know about PHP-GTK Thanks - Rajeev Patil Link Software systems Pvt Ltd Pune-India