The last tutorial on Flex and PHP included some code to send data back and forth from a MySQL database. One of the comments asked a question about sending only the relevant updated data to the server and I decided it would be nice to write a tutorial on how to do this. I am going to build off of the last tutorial for this so if you haven't looked at it I would advise it. Along with only updating the data that changes we are also going to differentiate between an update and delete.

To follow-up on the Flex and PHP tutorial we did earlier I thought it would be nice to do a complete tutorial on php, mysql, flex, and json. This tutorial should show a decent way to send data in a database to and from flex to php using json. I will explain this in more detail in just a moment.