As your projects grow in size and more people get involved you'll find yourself fixing more and more bugs. When this happens, one of the best friends a developer has is the debugger. In this paper, I'll talk about some of the workflows and tools you can use to debug Flex and PHP projects.
He shows you an example of the debugging with a sample script you can link to your Zend Framework installation (including a database backend). From there he includes the instructions on how to use Flash Builder 4 and the Eclipse PDT + XDebug combo to use the Flex debugger or PHP debugger (in Eclipse) to find the problems in the code.