Web Application Design Literature

Hello - I'm looking for recommendations on literature which will give me ideas on best practices for design and implementation of web applications, with if possible, PHP as its core reference language. Syntax has never been the challenge for me, like for most, it's always been the most practical and intelligent way to break up an application and focus on how to putting it all together for reusability and maintaining the application. Anyhow, suggestions are appreciated. Cheers! - sf