I agree you first need to enlarge your basic knoledge of the language thru a book (there are soo many about php). btw as far as i can see it seems you mostly n

I agree you first need to enlarge your basic knoledge of the language thru a book (there are soo many about php). btw as far as i can see it seems you mostly need to learn how to test and debug your applications. If the codebase is becoming unreadable and confusing consider a complete rewrite on your own or by moving to a lightweight framework (I liked code igniter and kohana in my php days) or even a different language (Ruby and Python are nice languages)