Data is stored in SWX files, that is read natively by Flash Player as "objects".
Can the client request the server to update/modify SWX files, much like a MySQL database? How? SWX-PHP?
Data is stored in SWX files, that is read natively by Flash Player as "objects".
Can the client request the server to update/modify SWX files, much like a MySQL database? How? SWX-PHP?
No.
Technically, data isn't stored in SWX files; SWX files are SWF files that follow a certain specification. There are some good definitions on the official web site. In SWX-RPC, the SWX file is the implementation of the Remote Procedure Call protocol involved, and the protocol is usable via an SWX service wrapper, which shouldn't need to be modified by client code - if you need to modify it, why?
What's stored in the SWX file is the actual code, in the Flash Player native format, for example (in SWX-RPC) to handle the interaction with the underlying service gateway.
What you probably want to do instead of modifying SWX files is have a method for producing the SWX files you need for your interaction with the service gateway. Usually, a new SWX will only be necessary when the service interface changes. If you want SWX files some other reason than service interaction, feel free to comment.
For SWX-RPC via PHP, the SWX-PHP site has good Getting Started examples.
You would have to read SWX files on the server side. This would propably be quite hard to do, and not very practical.
You might consider storing your data in a database instead (for instance MySQL) and access it using for instance SWX-PHP services.